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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Instigate]
#1758592
03/06/15 08:49 PM
03/06/15 08:49 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
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Not sure which pickup you have, I was thinking the newer one, but rockauto shows that and the older one as well. Does the pick up have a round connector or a flat one with two prongs?
As for unplugging the CTS theory, I dunno. It locks out the advance so you can set the timing but other than that I have no idea what it would do. Have you tried it?
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Supercuda]
#1758593
03/06/15 09:26 PM
03/06/15 09:26 PM
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Joined: Jan 2015
Posts: 156
San Diego
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Quote:
Not sure which pickup you have, I was thinking the newer one, but rockauto shows that and the older one as well. Does the pick up have a round connector or a flat one with two prongs?
As for unplugging the CTS theory, I dunno. It locks out the advance so you can set the timing but other than that I have no idea what it would do. Have you tried it?
I have the round 3 prong. I'm going to try the cts thing right now. Out of ideas.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Instigate]
#1758595
03/06/15 10:32 PM
03/06/15 10:32 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
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Yeah, we're getting into what we call shotgunning now, throwing parts at it till something fixes it. I hate doing that but we're pretty much SOL unless someone else who knows more steps up. What sensors have you replaces, if any?
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Supercuda]
#1758596
03/06/15 11:16 PM
03/06/15 11:16 PM
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Joined: Jan 2015
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San Diego
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Quote:
Yeah, we're getting into what we call shotgunning now, throwing parts at it till something fixes it. I hate doing that but we're pretty much SOL unless someone else who knows more steps up. What sensors have you replaces, if any?
I know right? I hate to just throw parts at it but idk what else to try. I followed the steps in the TPS code tests and it says if it tests good the SEMC is prolly bad. But I hate to buy a new computer without being 100%.
o2
CTS
Not a sensor, but I replaced the EGR too.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Instigate]
#1758597
03/07/15 12:28 AM
03/07/15 12:28 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
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Well, who knows now. I hate to say it but maybe a new comp is the fix, but I hate spending money on something I am not sure will fix it either.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Supercuda]
#1758598
03/07/15 12:33 AM
03/07/15 12:33 AM
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Joined: Jan 2015
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San Diego
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Well, who knows now. I hate to say it but maybe a new comp is the fix, but I hate spending money on something I am not sure will fix it either.
For sure. For now I guess the plan is to throw the new TPS and pickup coil on it and if neither of those help I will have to throw a computer at it. lol
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: NITROUSN]
#1758600
03/07/15 02:54 AM
03/07/15 02:54 AM
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San Diego
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I had a customer come in with a reman long block with odd driveability issues. The builder left out the distributor oil pump drive bushing. Took a lot off screwing around before we figured out that issue. Does the timing hold steady or jump a lot? Just an item to be sure of.
Timing is pretty solid. I could tell they put a new bushing in, here is a picture. The shaft in the picture is the priming rod, that's why it looks so small.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Instigate]
#1758601
03/07/15 02:15 PM
03/07/15 02:15 PM
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Joined: Jan 2003
Posts: 18,417
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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I Live Here
Joined: Jan 2003
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UPPER MICHIGAN, MARQUETTE COUN...
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Quote:
Quote:
I had a customer come in with a reman long block with odd driveability issues. The builder left out the distributor oil pump drive bushing. Took a lot off screwing around before we figured out that issue. Does the timing hold steady or jump a lot? Just an item to be sure of.
Timing is pretty solid. I could tell they put a new bushing in, here is a picture. The shaft in the picture is the priming rod, that's why it looks so small.
Good that eliminates that possibility.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Instigate]
#1758603
03/08/15 01:30 AM
03/08/15 01:30 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
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Looks like the FWD distributors of the same era. That shutter wheel is attached to the plastic holder and those are notorious for loosening up int he FWD distributors. Is there any play or wiggle between the metal shutter wheel and the plastic?
I know the fix for the FWD ones was to either buy a reman or take apart the distributor and reattach the pieces more securely. In your picture there is a roll pin in the plastic collar you'd need to drive out to separate it from the shaft. To do that you'd need to pull the shaft out of the housing. There is a collar on the bottom of the shaft with another roll pin you have to remove to get it apart.
As far as I know you cannot get that wheel separately, just the pickup or the whole distributor is it for parts.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Instigate]
#1758604
03/08/15 01:44 AM
03/08/15 01:44 AM
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Joined: Jan 2003
Posts: 18,417
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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I Live Here
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Quote:
So I pulled the pickup coil and the teeth that pass through the pick were covered in corrosion. I cleaned up the teeth and put a new pick up coil in and it seemed to make a difference. The vacuum is still vibrating between 1hg but the truck isn't stalling when I come to a stop anymore. Going to smog it on Monday and see how she does. I cleaned the teeth with a very small wire brush on a drill and still couldn't get it perfect. Is that part replaceable? Does it even mater if its cover in corrosion? My dad is no mechanic but he suggested that maybe it doesn't mater because it doesn't look like a replaceable part. Here is a picture of the teeth in the dist I'm talking about.
Spray a little wd40 on it. If the plastic rivets are not loose the reluctor is fine. If you don't have a vented cap that is what trapped moisture does to the reluctor.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: Instigate]
#1758606
03/08/15 11:22 AM
03/08/15 11:22 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
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About to go away
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good, at least something is ok for once.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 89 318 TBI Freshly Rebuilt Engine Idle Surging / Stalls
[Re: moparmojo]
#1758610
03/10/15 03:04 AM
03/10/15 03:04 AM
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Joined: Jan 2015
Posts: 156
San Diego
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Yes but this one should just have the idle speed motor. It mounts to throttle body and actually controls the throttle lever. It can be ruled out by disconnecting the wire harness, then adjusting the idle speed up to where you could drive it around and see if it still surges etc. 
I did that today before I went to my friend's shop. Didn't help.
Quote:
Ok so I will take a shot at this only because I have been fighting issues on my 92. Not the exact same thing but maybe something you will find beneficial.here are my thoughts.
You may have a sticky iac motor. They get carboned up and the plunger doesn't react quick enough thus causing Boggs and sometimes stumbles especially coming to a stop. I recently changed mine and was happy with the drivability improvement.
Several years ago I also experienced severe issues with the truck dying. Turned out to be a plenum gasket causing a vacumm leak. This made the computer richen the fuel up so much it would die.
There is a video on YouTube on how to test the plenum gasket using a vacumm gauge. When I found that test was negative, it lead my to changing the ďac on the throttle body.
It's a freshly rebuilt engine. The gasket isn't leaking.
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