1993 gmc suburban 1500 5.7 l has a rough loping idle, stalls in reverse unless given gas, and smells like it is running rich. fuel pump and vacuum hoses sound like reasonable fixes?
Idle air control (IAC) control rpm idle during idle.
Test it on idle with ALL electrical on full force.
RPM should increase.
If RPM remain the same then IAC is question.
SOURCE: rough idle and lopes
Those 4.3L's have a Central Port Fuel Injection system with one injector in the middle of the intake under the plenum, they are good for either the fuel pressure regulator or the plastic lines (that are inside the intake that feed the injector) leaking inside and flooding the intake with fuel. The best way to tell is to take the plenum off and thurn the key to prime the fuel pump and watch for leaks.
SOURCE: HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.
Try replacing the ignition control module it is located under the distributor cap Cost is around $30.
SOURCE: 1998 GMC Sierra- runs rough then stalls when
had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!
SOURCE: rough idle(rich) stalls in gear
Basically clean up before use like opening the plugs and adjusting the spark gaps, spray some carb cleaner at the intake & if The soud of the engine smoothens even slightly, then add some it to the fuel in the fuel filter & gun the engine a few time. Flush the radiator and fill in frsh coolant/water. Check the level of water in the battery and top up with distilled water. Clean the air filter and check fan belt tightness. After these small maintenace checks it should run OK.......sodeep
SOURCE: 1995 safari van w stalls when giving it gas.
maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?
It can be issue
with IAC( idle air control valve) causing the problem.
There
are many other possibilities causing these idle issues. Engine idles rough.
There
are few help links with solutions to troubleshoot such idle issues.
I
suggest you refer the link below and follow
its troubleshooting details:------
Click
the link below:-----
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http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
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http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
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http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
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Cold start problem and vehicle shudder around 2500 to
3500 rpms
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http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
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http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
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http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
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http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html
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http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
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http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
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High
Idle Problem
http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html
-------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
--------
http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-------
http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html
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http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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These
details will help.
Thanks.
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