Question about 1988 GMC S-15

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High idle gmc 1988 s15 poor fuel economy no check engine light

I have a 1988 gmc s15 starts after cranking for a while then idles high even after warming up stays that way run and drives but idles high and very low fuel ecomomy

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Change the temperature control sensor to the front if the engine near radiator
1 start the truck let it run till you think it is at normal operating temperature
2 unplug the temp sensor if the idle changes then the sensor is bad

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

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SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

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SOURCE: I have a 1988 GMC Sierra 1500 that wont stay running

1988 gmc runs for a little but dies. Check your c.t.s that checks the temp. of your coolent and when it fails it tells computor engin is hot, t.p.s takes over closes butterfly and chocks the air to keep engine from runnin to lean. If engine is not hot it will flood and stop runnin then some time will go by befor truck tries to start. May not be probablem but its a thought. c.t.s is located on manifold by top radiator hose neck. My truck was fine than sat had simmilor problem when i went to use again thats what i changed and seems to be back to normal. Hope this helps.

Posted on Sep 08, 2009

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SOURCE: GMC envoy after I filled gas tank the low fuel

You will need to replace the fuel level sensor which is in the fuel tank.They have a lot of problems because the metal fingers on the sensor wear off and gives you the incorrect readings.This will also cause the check engine light to come on.You will probably have a level sensor code.This will be a lot easier if the fuel level is down to about a quarter tank or less.Also you should be able to get just the level sensor and not have to get the complete fuel pump module.Good luck.

Posted on Dec 02, 2009

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SOURCE: low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge

While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!

Posted on Mar 01, 2010

  • 2926 Answers

SOURCE: My 2003 GMC Sierra Idles Rough And Cut Off

Before replacing the O2 sensors, I would check the fuel pressure. You may also try to have someone pull a trouble code from the powertrain control module to verify why the engine light is on. Do not replace any parts until this is done, otherwise your going to be guessing at the root cause, and it will get expensive with part replacement.

Posted on May 12, 2010

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1 Answer

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If the check engine light is on, you would need to check the computer for trouble codes first.
If the engine is fuel injected, it could be a bad injector. If it has a carb, it could be a sticking choke or an internal leak.

Apr 30, 2013 | GMC Sierra Cars & Trucks

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Error code 33 on 1988 gmc s15 2.5 When the motor warms up the check engine light turns on and when I drive it it turns off after a couple of feet of driving. Any suggestions?


Code 33 means MAP sensor signal has low vacuum or circuit voltage is high here is the tricky part it can also point to a failed distributor reluctor so do this inspect the vacuum hose that attached to it at idle is there full vacuum then check the connection it safer just to replace it including the vacuum hoses if the code comes on check the timing make sure it correct also when you floor it does it stumble or cough if it does its the whole distributor will need to be replaced

Aug 18, 2011 | 1988 GMC S-15

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1988 gmc 5.7l engine, changed, iac motor, map sensor, fuel press. regulator, fuel pump, fuel filter, timing gear and chain, distributor, has no cat. converter , yet still cranks a long time before...


i have the same exact problem, i have replaced fuel injectors, idle position sensor, idle air sensor, map sensor, temperature sensor,. the only way i can make mine run ok. not great is unpluging the map electrical connector, and it still has no power if u gas on it but it makes it down the road and smells rich, if u find out let me know what the problem was i really love my truck and hate that it doesnt run right, Redemmett21@aol.com

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1 Answer

1994 gmc safair 4.3 wont run at idle and bad enough at high rpm you can't drive it. replaced plugs,wires,cap.roter,o2 sensor,used throttle body,used computer,new fuel pump,new fuel filter,can't figure it...


Is the "service engine" light on at all?
If so, what codes are present.
Have you checked the EGR valve. If the valve is stuck, the engine will idle very poorly. You can remove it and clean the carbon deposites and make sure it moves freely.
The EVAP purge solenoid will also cause an idle problem but should show up as a service engine light problem.
Let me know.
Regards,

Apr 20, 2009 | 1994 GMC Safari

1 Answer

88 GMC S15 starting plus other problems


REplace the fuel filter, then check for vaccum leakes around the intake. My guess is the carb it close to falling off! LOL Frankster016

Dec 07, 2008 | 1988 GMC S-15

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