what am I missing

Asked by Mar 12, 2015 at 01:17 AM about the 2005 Pontiac Grand Prix Base

Question type: Maintenance & Repair

i have an 05 Pontiac GP..none GT or GtP or GXP..ran fine for 9 years so
far..1.5 year ago had issues that ended up needing a new set of wires and
plugs..it has a K&N lifetime air filter last week it went to running bad..so I
replace a coil that appeared to be bad..which ended up being the module..and
two more coils later it did better but today it started it again on my way to
work..cleared a codes by unplugging the battery for a long while..doesnt
seem to have really helped..could working on my car in the rain have
contributed to my issues and waiting to see what will happen sound like a
good idea

4 Answers

3,005

What codes do you have? You can get any major autoparts store to scan your codes for free. That will help narrow down the possibilities. If the K&N filter was over-oiled, it may have coated the mass airflow sensor, causing it to read the wrong values.

3,005

Also, make sure the wires for the mass airflow sensor are plugged in properly and check for any leaks in the vacuum lines leading to the brake booster. Sometimes those can get cut or disconnected and cause the engine to run rough.

595

Sounds like you have failed to maintain the car properly being as it had to break down for you to change the plugs. And there is no lifetime air filter. They must be changed, or at least cleaned. Sounds like Dorian has already given you good advice. Follow a car maintenance schedule for fewer problems, and best of luck.

3,815

First mistake, well maybe not the first, was clearing the codes. Those codes don't influence performance, they are a record of what is going on with your car. Drive it for a bit to establish some new codes and then have them read to see what is going on with your car. That and everything that Dorian and Astre said.

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