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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Having misfires and horrible running getting zero's on short

Customer Question

Having misfires and horrible running getting zero's on short term fuel trim and long term fuel trim. No check engine lights
Submitted: 11 months ago.
Category: Chevy
Expert:  kalamykid replied 11 months ago.

zeros on the trim is actualy good. Have you checked for any codes being set?

Customer: replied 11 months ago.
No codes , I've never seen a car with zero short and long term in 20 years l, scan tool shows 800 misfires in less than 1 minute
Customer: replied 11 months ago.
Car idles fine , under throttle it craps out ... Will run fine at certain moments
Expert:  kalamykid replied 11 months ago.

What cylinders are miss firing? Are you saying the trim does not ever change?

Customer: replied 11 months ago.
Well I seemed to have fixed the trim issue, but all cylinders are Mis firing
Expert:  kalamykid replied 11 months ago.

How old is the cap and rotor button?

Customer: replied 11 months ago.
Brand new
Expert:  kalamykid replied 11 months ago.

What brand did you use?

Customer: replied 11 months ago.
Ac Delco , also new Cpk, tps, egr, wires, plugs, all 02 sensors
Expert:  kalamykid replied 11 months ago.

Can you pull the cap off and check the rotor button and see how far up you can pull it? Also check the metal tab on the tip and see if it looks like it has been hitting some thing?

Customer: replied 11 months ago.
New distributor, spider gears, fuel pressure regulator, and pump/filter also, this guy just threw parts at it!! I will check that in the am, you thinking ignition related?
Customer: replied 11 months ago.
Lol sorry spider injectors
Expert:  kalamykid replied 11 months ago.

If the trim is staying right around 0, then it will not be due to air flow or a vacuum leak. That only leaves timing or compression.

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