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exhaust is so potent it hurts my throat

Posted By: cal_gecko

exhaust is so potent it hurts my throat - 11/10/14 03:09 AM

I've noticed the last couple times I've driving the Dart (mild 360), the exhaust is getting really potent - burns the back of my throat when I'm driving .. it's also got a little bit of a stumble off the line, and every now and then if I jump on the gas after sitting at a stop light, it'll give a pop out the carb.. sounds to me like timing? I had it running really good, no stinky exhaust.. but lately I've been noticing it getting worse.
Posted By: mikemee1331

Re: exhaust is so potent it hurts my throat - 11/10/14 03:28 AM

Quote:

I've noticed the last couple times I've driving the Dart (mild 360), the exhaust is getting really potent - burns the back of my throat when I'm driving .. it's also got a little bit of a stumble off the line, and every now and then if I jump on the gas after sitting at a stop light, it'll give a pop out the carb.. sounds to me like timing? I had it running really good, no stinky exhaust.. but lately I've been noticing it getting worse.


pull a spark plug, take a pic and post it. i'll bet it's running rich.
Posted By: GoodysGotaCuda

Re: exhaust is so potent it hurts my throat - 11/10/14 03:31 AM

Sounds rich.


Check into a wide-band o2 gauge and/or recorder. Step into the 21st century and forget looking at plugs.
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 03:32 AM

Quote:

Sounds rich.


Check into a wide-band o2 gauge and/or recorder. Step into the 21st century and forget looking at plugs.



I'd need to put one in each header, right? I've been thinking about this, actually
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 03:33 AM

Quote:

Quote:

I've noticed the last couple times I've driving the Dart (mild 360), the exhaust is getting really potent - burns the back of my throat when I'm driving .. it's also got a little bit of a stumble off the line, and every now and then if I jump on the gas after sitting at a stop light, it'll give a pop out the carb.. sounds to me like timing? I had it running really good, no stinky exhaust.. but lately I've been noticing it getting worse.


pull a spark plug, take a pic and post it. i'll bet it's running rich.



once the engine cool off, I'm going to pull a plug or two.. but I had it tuned a few months back, and we got the AF ratio dialed in really well and I haven't changed anything in the carb since then (Edelbrock Performer 600 cfm)
Posted By: GoodysGotaCuda

Re: exhaust is so potent it hurts my throat - 11/10/14 03:44 AM

Quote:

Quote:

Sounds rich.


Check into a wide-band o2 gauge and/or recorder. Step into the 21st century and forget looking at plugs.



I'd need to put one in each header, right? I've been thinking about this, actually



Ideally, yes.

But one could assume matching jets and idle screws on both banks would get you close on the unmonitored bank. Even that way, you'll be able to fine tune idle, part-throttle cruise, and WOT far more efficiently than reading plugs.


I wouldn't hesitate to buy something like an LM2 duo, or similar, if I was going to be running a carb'd car down the road. Log inductive RPM, each banks A/F and i think engine temp or a couple other parameters could be monitored with that.
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 04:52 AM

Quote:

Quote:

Quote:

Sounds rich.


Check into a wide-band o2 gauge and/or recorder. Step into the 21st century and forget looking at plugs.



I'd need to put one in each header, right? I've been thinking about this, actually



Ideally, yes.

But one could assume matching jets and idle screws on both banks would get you close on the unmonitored bank. Even that way, you'll be able to fine tune idle, part-throttle cruise, and WOT far more efficiently than reading plugs.


I wouldn't hesitate to buy something like an LM2 duo, or similar, if I was going to be running a carb'd car down the road. Log inductive RPM, each banks A/F and i think engine temp or a couple other parameters could be monitored with that.



zoinks!! Not inexpensive!!!
Posted By: ahy

Re: exhaust is so potent it hurts my throat - 11/10/14 04:59 AM

Per your experience, a mild cammed engine should not be stinky. Good idea to check ignition first. Visual inspection of cap, rotor, distributor and plugs. Check timing also. If the wires are old, replace. It may well be a carb problem, but best eliminate ignition first.
Posted By: RapidRobert

Re: exhaust is so potent it hurts my throat - 11/10/14 05:14 AM

Too rich or too lean could make it gassy. A lean misfire, the cyl is too lean to fire but the unfired (even tho lean) mixture which is still potent enough then goes out the tailpipe & you smell it. Yes an LM1 would be state of the art for tuning but something is deteriorating/going bad unrelated to your current jetting cuz it was running OK before now it ain't. lets find/fix it. I never discount a basic compression/leakdown tests then I'd start with the plugs/plug wires for a possible misfire culprit (& rotor phasing/radial gap may be borderline) & float level/saturated for a rich condition. Holler how it turns out. EDIT reread & saw the hesitation, I'm thinking lean misfire, vac leak maybe
Posted By: Cab_Burge

Re: exhaust is so potent it hurts my throat - 11/10/14 05:34 AM

How old is the gas in the car?
Posted By: GoodysGotaCuda

Re: exhaust is so potent it hurts my throat - 11/10/14 05:46 AM

Quote:


zoinks!! Not inexpensive!!!



Tool to be used on a car that's how expensive? For how many years?

It'd be an investment, and you can certainly get by with just the tool and a single wideband though. If you forsee messing with carbs for a while, it's not a bad way to go.

Have some friends run O2 bungs in their cars and split the cost, rent it to them, etc. three cars over three years would be $72/car/year to tune with the best thing out there. It doesn't sound so bad that way.. Log at the track, on the road, summer, winter, etc. having that data available is really handy.

I usually find a way to make specialty tools pay for themselves
Posted By: Supercuda

Re: exhaust is so potent it hurts my throat - 11/10/14 05:47 AM

One thing, dual planes feed two cylinders on each side of the engine. Single planes feed all eight from a common plenum. Monitoring one side will tell you something about both sides of the carb regardless.
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 05:49 AM

Quote:

Quote:


zoinks!! Not inexpensive!!!



Tool to be used on a car that's how expensive? For how many years?

It'd be an investment, and you can certainly get by with just the tool and a single wideband though. If you forsee messing with carbs for a while, it's not a bad way to go.

Have some friends run O2 bungs in their cars and split the cost, rent it to them, etc.

I usually find a way to make specialty tools pay for themselves



and you also have local friends who are into cars! My best friend drives a Range Rover or his wifes car - an Infiniti G37S.. my other close friend drives a Focus.. LOL
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 05:50 AM

OK.. plugs are a little white ... and .... 'fuzzy'...

And gas is fine.. I fill it up about every other week, I've put 5k miles on it in the last 10 months...

Attached picture 8326812-IMG_5828.jpg
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 05:51 AM

2

Attached picture 8326813-IMG_5830.jpg
Posted By: Supercuda

Re: exhaust is so potent it hurts my throat - 11/10/14 06:09 AM

Looks either a tad rich or the heat range is a step cold.
Posted By: Kern Dog

Re: exhaust is so potent it hurts my throat - 11/10/14 07:19 AM

Quote:



and you also have local friends who are into cars! My best friend drives a Range Rover or his wifes car - an Infiniti G37S.. my other close friend drives a Focus.. LOL



Offers have been made to you on several occasions from people not too far from you but you don't seem to want to take them up on it. Your thread regarding the tuning before dyno day was one example. The fuel issues you had could have been fixed within a couple of hours if you would have tapped your local resources. If you continue to ignore the offers, they will surely cease to exist.
Posted By: cjskotni

Re: exhaust is so potent it hurts my throat - 11/10/14 11:17 AM

Quote:

OK.. plugs are a little white ... and .... 'fuzzy'...

And gas is fine.. I fill it up about every other week, I've put 5k miles on it in the last 10 months...



I'm no expert on reading spark plugs but that looks super lean to me! If it were running rich, the plug would be black and sooty.
Posted By: lewtot184

Re: exhaust is so potent it hurts my throat - 11/10/14 04:18 PM

anti-freeze/water?
Posted By: RJS

Re: exhaust is so potent it hurts my throat - 11/10/14 05:27 PM

Is the distributor loose by chance and moved?
Ron
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 05:48 PM

checked the distributor .. it's still nice and tight.. all I did last night was pull a couple plugs and see that they look like this .. I did check in with the guy who dyno'd it and he's thinking it may be caused by the winter fuel mixture here in CA - says a lot of guys' cars run like crap on it..and the deposits on the plugs are most likely from the crappy gas. and now that the weather is cooler (70's), it might be running a bit leaner .. he's going to check his notes from our tune and give me a recommendation on different metering rods to help the AF ratio.

Unrelated .. something is spraying on the front drivers side of the engine ... not sure where it's coming from ... there's not really anything over there! White deposits from... something.
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/10/14 05:49 PM

..

Attached picture 8327058-IMG_2691.JPG
Posted By: 70satelliteguy

Re: exhaust is so potent it hurts my throat - 11/10/14 06:41 PM


"something is spraying on the front drivers side of the engine"

Hope it is not a head gasket leaking from that side of the motor

Mike
Posted By: Supercuda

Re: exhaust is so potent it hurts my throat - 11/10/14 06:50 PM

Quote:

anti-freeze/water?



Those plugs would be steamed clean if that was the case.
Posted By: RSNOMO

Re: exhaust is so potent it hurts my throat - 11/10/14 07:00 PM

Quote:

something is spraying on the front drivers side of the engine ... not sure where it's coming from ... there's not really anything over there! White deposits from... something.




Bring it to OT, and get the pressure-tester out...
Posted By: lewtot184

Re: exhaust is so potent it hurts my throat - 11/10/14 07:02 PM

Quote:

Quote:

anti-freeze/water?



Those plugs would be steamed clean if that was the case.

not necessarily. looks like lime on the plugs to me.
Posted By: Beebuzzn

Re: exhaust is so potent it hurts my throat - 11/10/14 08:11 PM

I did a little work this weekend on a 1994 Mazda truck I have as it was running a little rough, the plugs looked identical to your pictures. My first thought was the gas. New blend for our west coast green states ? coolant level is right where it is supposed to be. Put new plugs and wires on runs much better. Plugs only had about 4k miles on them.
Posted By: GTX MATT

Re: exhaust is so potent it hurts my throat - 11/10/14 11:27 PM

The fuzzyness is from fuel additives
Posted By: ahy

Re: exhaust is so potent it hurts my throat - 11/11/14 02:09 AM

Quote:

The fuzzyness is from fuel additives

... Or oil additives. I have seen similar on an engine with lose valves, poor seals and high oil consumption.
Posted By: 71GTX471

Re: exhaust is so potent it hurts my throat - 11/12/14 02:11 AM

try some AV fuel N see how it runs.
Posted By: RapidRobert

Re: exhaust is so potent it hurts my throat - 11/12/14 02:31 AM

Quote:

Bring it to OT, and get the pressure-tester out...

That's what I'd do, pump it up to 15 when hot and do a compression test. I believe that'll uncover something
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/12/14 09:03 AM

Quote:

Quote:

Bring it to OT, and get the pressure-tester out...

That's what I'd do, pump it up to 15 when hot and do a compression test. I believe that'll uncover something



can you please explain? I thought the pressure tester was for the cooling system? How will doing a cooling system pressure check while doing a compression check show something?
Posted By: Jjs72D

Re: exhaust is so potent it hurts my throat - 11/12/14 09:39 AM

Quote:



can you please explain? I thought the pressure tester was for the cooling system? How will doing a cooling system pressure check while doing a compression check show something?



I guess that you missed the post regarding the white specks on the engine and it possibly being a coolant issue. A cooling system pressure check may display a leak which may have led to the white specks.
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/12/14 09:55 AM

Quote:

Quote:



can you please explain? I thought the pressure tester was for the cooling system? How will doing a cooling system pressure check while doing a compression check show something?



I guess that you missed the post regarding the white specks on the engine and it possibly being a coolant issue. A cooling system pressure check may display a leak which may have led to the white specks.



OK... I can understand how doing a cooling system pressure check would help determine if that's an issue.. but how could doing a compression check at the same time show something? Just trying to understand what I'd be looking for ...thanks!
Posted By: cal_gecko

Re: exhaust is so potent it hurts my throat - 11/15/14 01:54 AM

Think I may have found a culprit..

I decided to pull all the plugs to look at them (and replace them).. 7 of them looked like the images I posted previously.. then there was this one..

Am I correct in surmising that this was not firing? It was in the cylinder at the back of the engine on the drivers' side.. the hardest spark plug boot to get to, since the power brake booster is right in the way, and the plug boot rests against the header (I have fiberglass heat insulation boot on the plug boot)..

Attached picture 8331385-10756661_10152824553531675_583908826_o.jpg
Posted By: RapidRobert

Re: exhaust is so potent it hurts my throat - 11/15/14 02:30 AM

Cal we were sayin to do the compression test AND the coolant pressure test (not at the same time). Not sure if the plug ain't firing or if it is fouled but I'd toss another one in (other 7 wouldn't hurt also) & see how it acts & I'd still do the pressure and compression tests cuz didn't you say earlier that something up front was sprayin out on the fender? EDIT I reread & it DID sound like I was sayin to do both at the same time
Posted By: Supercuda

Re: exhaust is so potent it hurts my throat - 11/15/14 05:30 PM

Quote:

Think I may have found a culprit..

I decided to pull all the plugs to look at them (and replace them).. 7 of them looked like the images I posted previously.. then there was this one..

Am I correct in surmising that this was not firing? It was in the cylinder at the back of the engine on the drivers' side.. the hardest spark plug boot to get to, since the power brake booster is right in the way, and the plug boot rests against the header (I have fiberglass heat insulation boot on the plug boot)..



Looks oil fouled
Posted By: Golden-Arm

Re: exhaust is so potent it hurts my throat - 11/15/14 11:20 PM

Quote:

the exhaust is getting really potent - burns the back of my throat when I'm driving



if you're getting gassed while driving, you have bigger problems. find out why the exhaust is coming into the cabin, before it takes you out. then fix it.
Posted By: moparmikethree

Re: exhaust is so potent it hurts my throat - 12/04/14 10:09 PM

My Challenger had the same problem. Ended up being a hole in the piston. Do a compression test
Posted By: attaboy

Re: exhaust is so potent it hurts my throat - 12/05/14 05:24 AM

Had the same problem with my 440. Turned out to be a large vacuum leak around the intake manifold. Dribble some soapy water or spray some WD40 all around the intake manifold where it meats the heads while the motor is running. Should be able to see if there is a leak.
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