1988 gmc 1500 problems
March 26th, 2010, 9:30 PM
#13
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ok new problem the truck now runs smoother i messed with the iac plunger a bit and it runs better but under hard acceleration its studders i also hooked up the egr and everything all the vac lines.but now it only studders under hard accleration now when you floor the gas pedel it studders for like maybe 2 or 3 seconds then it gets smoothe stops the studder AND THEN it picks up power and starts to pull hard any info or advice thx
March 26th, 2010, 9:37 PM
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by iac clean you mean the port that the plunger goes in.and i have never cleaned an egr i always just bought one lol ill google that part though and i havent rechecked timing.
March 26th, 2010, 9:42 PM
#16
the iac itself has a pintle on it that may get dirty which will cause it to not seal right inside the throttle body. if there's any dirt or carbon on it or in the throttle body, you'll need to clean it out. pretty much same with egr. if it's dirty, it won't work right. also, make sure all vacuum lines are hooked up, not broken, and all ports on throttle body that don't have a line are plugged.
March 26th, 2010, 10:10 PM
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o yea 1 more thing after running my engine for maybe 3-5 miles my check engine light comes on but only after driving it a few miles its never on right when i crank it lol sry i left that out before
March 27th, 2010, 9:38 AM
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ok new issue while messing with my egr valve i noticed that when the engine gets heated up ill idle it up and the egr diaphram isnt moving like it should that combined with the fact that the check engine light only comes on after a few miles makes me think it could be the egr valve or the sensor the vac lines run through
March 27th, 2010, 11:56 AM
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ok i just pulled the paper clip test on my ecm lol i forgot about that till this morning and its shooting a error code 32 at me that is egr if i remember correctly and in some cases the map sensor right?