Question about 1987 Chevrolet G30

1 Answer

Do headers disrupt chevy 350 tbi performance

Surging replaced map sensor ,wires plugs,cap rotor,idle control,egr, still surging ,pulled oxegen sensor out runs better but not right

Posted by Anonymous on

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  • Chevrolet Master
  • 1,043 Answers

You might want to do a tail pipe pressure test to be sure your exhaust system is not partly plugged. I am assuming that you pulled the 02 sensor from the exhaust pipes or headers. The headers sound as if they have been on the truck for awhile and are not new to the unit so then I would not think they are causing the problem. But I tell you for sure the plugged exhaust system will.

Posted on Apr 10, 2017

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6ya6ya
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Posted on Jan 02, 2017

csmock132
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SOURCE: 87 chevy truck with TBI idles too fast

Spray the intake with carb cleaner to find the vacuum leak. Check where the EGR mounts and the throttle body gasket sense you had both off.

Posted on May 10, 2009

emissionwiz
  • 75066 Answers

SOURCE: pops back through the intake when it is cold runs

This problem can be caused by defective spark plug wires that are cross firing due to voltage leaking to a nearby plug wire as well as a flat camshaft lobe.

Posted on Jan 16, 2011

johnjnail
  • 1702 Answers

SOURCE: 91 chevy 2500 4x4 5.7 auto runs fine cold but when

when the engine starts the O2 sensor volts should be around .5 volts or 500mv so the 450mv is correct now i don't know wither your next statement is 115mv of 1150 mv it makes a big difference, so get back with me and i will see what i can do for you.

Posted on Apr 24, 2011

  • 370 Answers

SOURCE: i have a 1995 chevy

hesitation with TBI is sometimes a dirty Injector, make sure you have a good fan pattern on the injector and make sure its responcive. use a nylon wire brush to clean the tip, and alot of carb cleaner, also make sure that your butterfly moves freely, they tend to get gue/carbon build up on them and this will also cause a hesitation

Posted on Sep 22, 2011

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