Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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thanks for your service,,
tell me,after it dies,does it start right back up?
does it idle well?
does the engine light stay on?if so,can you give me the computer codes?
two things here..
1-emove the wire harness plugs that plug into the computer under dash behind the glove box,,clean the terminals with electronics parts cleaner then plug back up..
but,the problem seems to be the pick- up in the distributor,,you may just want to replace the complete distributer with a new rebuilt unit sense the distributor will need to come out and apart to replace it
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lets try this..
remove and clean the egr valve,make sure it is closing all the way,,then re-install it..then disconnect the vacuum line fom the egr valve and plug it,,if it runs better with the vacuum disconnected,,replace the egr solenoid
please stand by,perhaps one of the other guys has a clue to what is going on.
someone will be right with you
You said it only runs with the map sensor disconnected. Was the vacuum hose plugged or not? If not plugged or plugged , try the opposite and let me know what happens.
I would think that unplugging the vacuum line from the map sensor, then the map sensor would tell the computer that there is no vacuum and the computer would naturally think that the accelerator pedal is all the way down so the computer would adjust the fuel mixture accordingly like the gas pedal was floored but this isn't the case, is it. The gas pedal is at idle. At idle the fuel mixture usually rich I believe. Leaning it out makes it run better meaning it's too rich at idle. That is what I am gathering. So, if it's too rich, either afuel injector is dripping, the fuel pressure is too high or the air filter is clogged if it's even on.
It should be easy to see if a fuel injector is dripping. have you checked the fuel pressure?
Another thing, is the coolant temp sensor may be giving the wrong info to the computer making it think the engine is warm when it isn't and/or visa versa.
Are there any drips in the fuel injector spray cones? You have to look closely.
Did you replace the coolant temperature sensor or the coolant temperature switch, sometimes there are 2, one works the gauge and the other is for the computer to adjust things like fuel mixture, dwell and timing.
Don't you have an auto-parts store near you hat will allow you to rent or borrow their fuel system pressure tester? If not, order one from harbor freight or somewhere.
Doesn't this have the soda can sized fuel filter right on the frame rail under the driver seat? If s, unhook the fuel line going into that fuel filter from the tank and screw the fuel pressure tester T fitting in there.
Which kits, the ones they sell or the ones they rent or allow you to borrow? They should have the t fitting.
This is the one I have, see the T fitting, http://www.sears.com/actron-cp7817-throttle-body-injection-fuel-pressure-tester/p-SPM9169603524?prdNo=12&blockNo=12&blockType=G12
I believe this T works, https://actron.com/content/gm-tbi-adapter-716
I thought you were going to test the fuel pressure?
Test that tps, I didn't see if they were adjustable or not. Does it have slotted holes where the screws are?
Here are the test instructions,
Isn't there a procedure to setting that then? Did you check the Holley website for the adjustment procedure for that tps? If not, I'll look, but let me know.