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Recent content by 99GTPMLA

  1. 9

    99GTP Key Stuck in Ignition

    My 99 GTP key won't come out of the ignition unless you manually release it. Any body know what the typical causes are for this? My daughter has the car 3 hours away at college and I'm planning to go up next Saturday to fix it.
  2. 9

    Losing boost at higher speeds

    Something I don't notice that often because I don't often go this fast, but when doing wot, when it gets up to 90mph, my boost drops off and the engine sounds quieter. My boost gage drops to about 1/3 to half and the engine seems to lose the growl and a little power, but it still accelerates...
  3. 9

    Higher KR after LIM Change

    I have a 1999 GTP with PLOG, 3" catless downpipe, open cone air intake, and 1.95 modded stock rockers. I typically get about a max of 3.5 knock retard in 2nd gear full throttle. A friend and I changed the lower intake manifold gasket last Tuesday because I wasn't sure of the current one...
  4. 9

    Modified Rockers on Daily Driver

    I'm debating on purchasing and installing the ZZP 1.9 modified stock rockers om my 1999 GTP. I have 119,000 miles on it, and have the Plog and 3" downpipe for modifications. Otherwise it is all stock. I still get between 3-5 knock retard at 3rd gear WOT. This is my daughters (17 years old)...
  5. 9

    Installing PLOG on 99 GTP

    I am installing a PLOG in my 99 GTP and when it's bolted on, the bottom corner of the PLOG contacts the A/C compressor. Is this normal? The engine is completely stock. It looks like that could heat up the A/C compressor and cause it to fail.
  6. 9

    Auto Dimming Mirror

    I have the 3 pin automatic mirror on my 1999 GTP. The auto dimming feature does not work. I tested it and it is only getting .11 volts to the mirror. Where should I look to fix this? Thanks.
  7. 9

    Walmart 93 Octane Gas

    Walmart has the highest octane gas in my area for the lowest price. I've read comments on here about shell gas quality for the 3.8L SC engine. What brand of gas seems to run the best?
  8. 9

    Knock Retard on Stock 99 GTP

    I hooked up my scan gauge on my 99 GTP today to check and see if I was getting any knock retard. I have a completely stock gtp with no upgrades and have been debating about getting the Speed Daddy headers in the future. I now am getting about 2 -3 knock retard under WOT through 2nd gear and it...
  9. 9

    Rough Idle with intermittent idle miss

    I have a 1999 GTP I purchased about 9 days ago with 114,000 miles, and I've gone through a lot of tune-up procedures and am getting a stumbling/missing at idle both in park and in drive when idling only. So far have have replaced the fuel pump, fuel filter, MAF sensor, spark plugs, wires...
  10. 9

    1999 Grand Prix GTP DTC P0303

    Hi, I'm new to this forum and just purchased a 1999 Grand Prix GTP with 113,000 miles. Driving it home from work today it threw the P0303 code which means cylinder 3 misfire. How can I check to see what the problem is? Thanks.
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