My 2002 Tahoe misfires at idle. I've replaced everything from plugs, wires,coils, injectors, purge valve and MAP sensor. Nothing has changed. All it's giving me is a. misfire code. It's a inexpensive test but I can't spend a fortune trying to get this thing running
2002 Tahoe has a misfire at idle
- Thread starter JohnnyK
- Start date
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mattbta
Full Access Member
P0300 or P030x where x is a number 1-8?
mattbta
Full Access Member
So random misfire. Does your scanner have the ability to show counts on each cylinder? If so, is one more than the others by a large margin?
No upgraded camshaft in there?
No upgraded camshaft in there?
rockola1971
Full Access Member
Pop intake snorkel off and with engine running, spray mists of water from a spray bottle into throttle body. Keep doing it without killing the engine for 5-10mins. This will cause any carbon buildup in combustion chamber and piston crowns to dislodge and shoot out the exhaust. Put it all back together, clear codes and see how if misfire comes back. High mileage engines typically have alot of carbon buildup.
The misfire is so bad that it won't stay running after startup. The Tahoe was running great up until I stopped at a red light. Then all of a sudden it died. No signs of any problems. I have to put my foot on the throttle for it to start.
afpj
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If you pull the vacuum line off the fuel pressure regulator, does any gas drip out?
What's the fuel pressure when you make it run?
When was the throttle body last cleaned, and how does it look now?
When was the throttle body last cleaned, and how does it look now?
