I have the codes - how do I fix???
buschwakker
07-10-2005, 10:11 AM
1998 4.3 with rough idle when cold - then fast idle (1200 rpm). Real poor gas mileage. Getting Pending Codes P0171 & P0507. I have the descriptions but how do I proceed to fix? Thanks for ideas.
BlazerLT
07-10-2005, 02:03 PM
Check all vacuum lines going to and from the engine, sounds like you have a vacuum leak.
blazee
07-10-2005, 03:28 PM
Most likely a vacuum leak
You can also try:
Cleaning your MAF
Cleaning your IAC valve
Make sure that the butterfly isn't partially held open by carbon or a sticky throttle cable.
You can also try:
Cleaning your MAF
Cleaning your IAC valve
Make sure that the butterfly isn't partially held open by carbon or a sticky throttle cable.
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