1999 Chevy Suburban, 5.7 L. 148,000 miles, all power options #5 cylinder code

100

Asked by May 03, 2014 at 01:16 PM about the 1999 Chevrolet Suburban K1500 LT 4WD

Question type: Maintenance & Repair

My truck did not pass NH state inspection emissions test because:

bank 1, sensor 1- O2 sensor
#5 cylinder
check engine light was also burnt out

I replaced all 8 spark plugs, both front O2 sensors, cap & rotor and check engine bulb

I have not replaced plug wires, have not replaced air filter, did not replace coil pak
(but it's only one code for one cylinder) have not had oil changed yet, there is not
"rotten egg" smell.

No codes for O2 sensors, but, still a code for the #5 cylinder and the check engine
light is still on, I can clear it with a scanner, but within a mile it comes back on.

My truck runs like it's brand new- there is no "skip" or "miss" because of the #5
cylinder. Smooth acceleration, plenty of power, idles quietly.

If I clear the check engine light right before it is inspected will it pass? Does the #5
cylinder have anything to do with emissions?

3 Answers

17,355

I'm assuming when your saying code for the #5 cylinder you mean code p0305 cylinder 5 misfire. And IF that is the case your plug wire is a probable cause. Or the cylinder could have low compression.

100

Thank you. Hopefully it's not low compression, nothing seems to be indicating that it would be that right now, but I can certainly change the wires to start with. But, does the #5 misfire have anything to do with the emissions test? Is that a mechanical issue or an OBD inspection issue?

17,355

an emission inspection wont let you pass it you have any codes period. but a missfire will make the vehicle throw out more harmful emissions due to it running poorly. Try to find someone with a compression tester just to be sure

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