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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5783
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Let me give you the details, 5.3 vortec engine. number 7 and

Customer Question

let me give you the details
JA: What is the model/year of your GM?
Customer: 5.3 vortec engine. number 7 and 8 cylinders are misfiring.
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: compression is normal. fuel injection normal. computer says has miss fired over 700 time over an unknow pieriod of time
JA: OK. To minimize me, please click the down arrow at the top right corner of this box.
Customer: steady whe accelerateing
JA: What year is your GM?
Customer: 2001 suburban
JA: Are you fixing your Suburban yourself? What have you tried so far?
Customer: no a mechanic is and he is totally stumped. everything is checked out fine
JA: Anything else you want the mechanic to know before I connect you?
Customer: he did switched the wire from the coil from the number 2 cylender and stiil is misfiring
Submitted: 7 months ago.
Category: GM
Expert:  Chris (aka- Moose) replied 7 months ago.

Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.

Is this a subtle misfire or bad enough you can feel it occurring?

When you say fuel injection is normal are you saying the injectors have been tested to be good and the signal to them scoped and confirmed not dropping out?