'85 150 bogs, Not the accelerator pump...what is it???
#1378685
01/30/13 05:37 PM
01/30/13 05:37 PM
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Joined: Jan 2013
Posts: 77 Louisiana
rnch
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Posts: 77
Louisiana
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My '85 Dodge 150 ram, 318 engine, torqueflite, hesitates/bogs/gasps when stepping on the accelerator, after reaching operating temperature (180 degree thermostat).
It feels like a worn out accelerator pump in it's 2 barrel holley carb...but is something else.
If you push down more on the gas pedal when the hesitation is starting, the engine will continue to run....otherwise the engine will die. It will restart immediately.
Only does this when the engine is warm; runs flawlessly when cold/warming up.
We've changed out the following:
carb, fuel filter, coil, spark plugs & wires, dist cap & rotor, ignition module, fuel pump, plugged the EGR vaccum line, plugged the vaccum line for the diaphram on the manifold heat riser, swapped out the rebuilt carb with a known good one.
As I said above, this bog/gasp/hesitation feels for all the world like a worn out accelerator pump.
The bog only happens when the truck is in motion, sitting at the curb I can gun/race the engine with no hesitation happening.
Wadduathunk? Your help/advice/opinions, please.
Last edited by rnch; 01/31/13 05:23 PM.
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: rnch]
#1378686
01/30/13 05:52 PM
01/30/13 05:52 PM
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Joined: Jan 2006
Posts: 452 Coeur d Alene, Idaho
jimbob101
mopar
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mopar
Joined: Jan 2006
Posts: 452
Coeur d Alene, Idaho
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If it sounds like not getting enough fuel, maybe the fuel pickup sock in the fuel tank is plugged OR a weak fuel pump. Replace fuel pump (cheap) then take some compressed air and blow back the line from fuel pump to the tank, that might clear the fuel pickup sock temporarilty to see if that's the problem. Then replace if diagnosing tells ya so.
you could Tee in a fuel pressure gauge somewhere after the fuel pump (in a rubber line part) and see what your pressure is running too, will let ya know.
I had a '89 Ram (although EFI) would run fine when cold, and once it was warm it fell on its face. Ran a fuel pressure gauge, would drop to 4psi when driving floored, warm. Revving in neutral was fine, but putting under load showed the problem. Pulled the tank and replaced electric fuel pump and sock, and all's good!
-J
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: jimbob101]
#1378688
01/30/13 06:59 PM
01/30/13 06:59 PM
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Joined: Jan 2013
Posts: 77 Louisiana
rnch
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Posts: 77
Louisiana
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Quote:
If it sounds like not getting enough fuel, maybe the fuel pickup sock in the fuel tank is plugged OR a weak fuel pump. Replace fuel pump (cheap) then take some compressed air and blow back the line from fuel pump to the tank, that might clear the fuel pickup sock temporarilty to see if that's the problem. Then replace if diagnosing tells ya so.
you could Tee in a fuel pressure gauge somewhere after the fuel pump (in a rubber line part) and see what your pressure is running too, will let ya know.
I had a '89 Ram (although EFI) would run fine when cold, and once it was warm it fell on its face. Ran a fuel pressure gauge, would drop to 4psi when driving floored, warm. Revving in neutral was fine, but putting under load showed the problem. Pulled the tank and replaced electric fuel pump and sock, and all's good!
-J
oops, forgot to list the fuel pump in parts replaced, will edit first post to add this.
JB, your stopped up sock theory does make sense!
I'll try back-blowing it this weekend, weather permitting.
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: rnch]
#1378690
01/30/13 07:14 PM
01/30/13 07:14 PM
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Joined: Aug 2006
Posts: 8,064 Iowa
76dodgeboy
master
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master
Joined: Aug 2006
Posts: 8,064
Iowa
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Quote:
Quote:
.
-J
JB, your stopped up sock theory does make sense! I'll try back-blowing it this weekend, weather permitting.
This can and will blow the sock off letting More stuff in the line. Pull the line at the tank before and Id suggest pulling the sending unit to inspect its condition
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: dezduster]
#1378692
01/31/13 01:46 AM
01/31/13 01:46 AM
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Joined: Jan 2013
Posts: 77 Louisiana
rnch
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Quote:
I had a brake booster leak that caused me issues that sound similar to your situation. Also check your PVC valve.
Why pcv valve?
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: rnch]
#1378694
01/31/13 04:41 PM
01/31/13 04:41 PM
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Joined: Aug 2005
Posts: 6,003 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,003
Salem
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Ha, welcome to the club. Best of luck to you! A lit match in the fuel tank is what's going to happen to mine. Some ideas for you here: Identical problem. Another big thanks to everyone who replied in that thread. Stumped 'em in the "Engine Tech" forum too! Link.
Last edited by Grizzly; 01/31/13 04:48 PM.
Mo' Farts
Moderated by "tbagger".
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: slantsic]
#1378697
01/31/13 05:48 PM
01/31/13 05:48 PM
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Joined: Jan 2013
Posts: 77 Louisiana
rnch
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Quote:
Sticky choke??? is it all the way open after warm up?
Opens up all the way when hot; I even bailing wired it open just to make sure last week when it was in the low 70's here in New Orleans.
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: scratchnfotraction]
#1378698
01/31/13 05:52 PM
01/31/13 05:52 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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my q-jet acts like this when it is dirty and the power piston sticks in the down position. it floods when it sticks in the up position. a good soak in carb cleaner fixes it. the crap fuel today has had me rebuild a lot of carbs for people this past yr. did you open the carb or the 2nd carb to see if any charcoal got sucked up in it from the charcoal canister? did you set the airgap on the reluctor/pick-up with a brass feeler gauge? is it the right gap? are you sure the vac advance or mech weights in the dist are not stuck or have a broke spring? is it advancing when reved up? when it is at idle does the timeing mark float around with a light on it? are you sure you did not cross any of the wires? thats ez to do and will run almost right but stumble like this. are you sure you did not move the plug wire 1 term on the cap throwing it off? this is where and why I have striped all of mine before I have this issues or when I have these issues. I prefer the 85 harness for this and have swaped an 85 harness into a few 88-93 truck when converting to carb for a clean hack job.
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Re: '85 150 bogs, Not the accelerator pump...what is it???
[Re: scratchnfotraction]
#1378699
02/05/13 05:48 PM
02/05/13 05:48 PM
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Joined: Dec 2004
Posts: 267 mpls,MN
dodgedakotaman
enthusiast
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enthusiast
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Posts: 267
mpls,MN
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Hi, reading Grizzlys thread on a similar problem, I have to agree it sounds like an air/fuel ratio problem. Grizzly, did you try replacing your intake manifold gaskets? Try holding the engine at 1500 RPM and spray some carb cleaner around the edges of intake manifold. Does the RPM increase? If so the gaskets are bad. Have you tried clamping the Pvc and booster hoses with vise grips and driving it? Just trying to eliminate any possible vacuum leaks that might affect the air/fuel ratio. Also, I would buy a fuel pressure guage and splice it in the fuel pump to carburator line and run enough hose so you can read it while driving. It would be helpfull to eliminate a fuel pressure problem. Could it be a worn cam eccentric? I would also get a vacuum guage and hook it to a good intake vacuum source. Is the vacuum reading steady or is the needle bouncing around which could indicate bad intake gaskets. Run enough hose so that you can read it while driving. We need to know what the fuel pressure and vacuun readings are doing when the bog occurs. Is your truck an auto or manual trans? I am confident with some good diagnostic techniques your problem can be solved. Grizzlys problem, too.
Last edited by dodgedakotaman; 02/05/13 10:19 PM.
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