Sup Mod keeping the peace
Joined: Dec 2004
Location: NJ (Philadelphia area)
Several things to check/replace:
- Spark plugs. Use only NGK OEM plugs.
- Dirty or leaking fuel injectors. Run some good injection cleaner, like Techron or Redline SL-1, through the system; give the cleaner about a week or two to do it's job.
- Vacuum leak. To check the intake system for a vacuum leak, attach a vacuum gauge to a full vacuum source. A good place to connect to is the charcoal canister. There should be three hoses connecting the carbon canister. Two of the hoses go to a purge valve that's built into the canister. The second larger hose off the purge valve should be your vacuum line. With the engine fully warmed up, the reading at idle should be 18 - 20 InHg. At 3,000 RPM, it should be around 21 InHg. If readings are under 18 InHg, check the intake manifold nuts to make sure they are tight. The gasket may have failed; spray a water mist at the gasket to see if the gauge reading changes. Also check the intake plenum bellows at the throttle valve and at the MAF for cracks or loose clamps.
- Leaking blow-off valve. Make sure all the clamps are tight.
- Leaking EGR valve.
KA-T for life, yo!