Re: 1997 Chevy Suburban 5.7 #6 misfirer PO306 what needs...
This is a misfire in cyc 6 i would first check the spark plug then boot and wire after that i would check the injector hopefully this fixes it if not all this ...the ICM may be the fault
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This is a code for cylinder #6 misfire. Most likely a bad spark plug or ignition wire for that cylinder ( most common repair ). There are various other reasons for a cylinder misfire as well.
PO300 and P1399 are random cylinder misfire detected.
PO301 cylinder 1 misfire
PO302 cylinder 2 misfire
PO304 cylinder 4 misfire
PO306 cylinder 6 misfire
I would say that you have damage to the ignition wiring harness or you ECM is failing.
Hi. You have misfires on cylinders 4, 5 and 6. If there are no faults on cylinder 1, 2 and 3 then I would check the power to the left bank injectors. Also check spark plugs and ht leads. If there are running issues then this should be an easy fix. If the faults are very intermitant then it can be a bit tricky to isolate.
Fix the misfire concern on cylinders 5 and 6. That will probably take care of the lean codes p0171 and p0174. The catalytic converter is probably damaged from the misfire concern....that's what is setting the p0420 code. Take care of these concerns first before fixing p1131 code
These are misfire codes.This means that your vehicle is missing.The 300 is a random misfire and the 305 is for cylinder 5,and the 306 is for cylinder number 6.Check the plugs if they are good then you could have bad coils.They are top of the plugs.Hope this helps.Good luck.
You will need to replace no 5 and no 6 coil pack and spark plugs. P0316 is random missfire that computer could not detect the cylinder that was causing it,just knew one was missfiring.
Coil packs are common concern on these vehicles. Can get oil leak into the coil pack wells and may also even get moisture into them.
If yours is a 3.9L it may be involved in owner satisfaction program 07M07 or 07N09 in which they will cover them under the program for up to 10yrs or 100000 miles which ever comes first.
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