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Leprechaun

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  • Present cars
    1998 Boxster

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  1. Steve, I've posted here once already. Think I' have solved my problem and this may work for you as well. Check your oil level. Mine was above the MAX level on the daskboard uage so I tokk out a Qrt of oil (it's 1.6 Qrts between the min & max line on the guage. Problem solved. It appears that if your oil is overfull oil can get up into the combustion chamber and these engines like to run on high grade fuel not oil. 2 100 mile communtes to and from work and not even a hicup so far.
  2. RFM, thanks for the input. The Bentley Shop manual I have has all of the fault codes for every Boxster/Boxster S from 1997 to 2004 and I've seen all 4, so it seems as though when the engine gets hot (as it approaches the temp the cooling fan turns on) that the fuel injection computer for some reason starts swinging from lean to rich on all 6 cyclinders until it gets lost and then starts the cough like it's running out of gas and then when I come to a stop the idle fluctuates and the engine will sometimes stall. The car runs Awesome at high speeds on the California Freeways becasue it never reaches a tempt where the fan will come on but when I get on the city streets during hot summer days this problem shows up. I'm wondering if it could be vapor locking and when the fuel injection system starts to see vapor instead of liquid it tries to compensate and doesn't recover. Is that possible? When you say leak where would that possibly be. I don't think it's a bad injector. If it was I think I would have the problem all of the time (correct)? Sliderr, As I suspected the Bentley shop manual describes Alternator as I always have. There's only 1 and it's teh main component of the battery charging system. Since you used Alternators referring to more than 1, when you say alternator what are you referring to? Regards,
  3. No and thanks for the tip. I'll get out my Bentley Shop Manual and do some research on that.
  4. I've Seen all 4 1123, 1125, 1128 & 1130 Lean and Rich Mixture messages for both cylinders 1--3 abd 4--6. I haven't checkd to see if it's logged any lately because the check engine light hasn't come back on yet.
  5. Looking for feedback from anyone who can help with this. I have a problem That only manifests itself at high engine temps just before the car reaches the temp the radiator fan turns on to start cooling. The enigne starts to cough lik it's running out of gas. When come to a stop the idle RPMs fluctuate up and down between 900 and almost 0. Sometimes it stalls unless I pump the accelerator. The fault codes I see are that the fuel injector system seems to loose itself and change the air fuel mixture from lean to rich and then from rich to lean and finally seems to get lost and then I'm starting to think that it may be minor vapor locking when the engine gets hot which might be the cause of the air/fuel mixture fluctuations. It only coughs but never stalls when the car's moving. I have changed the MAF, Both Engine side O2 sensors and the relay that operate the Fuel Injection system. The car also recovers when the engine has cooled down and gone through it's warm up cycle and returned the air fuel mixture.I remember reading somewhere when I first got the car and vapor lock was mentioned but I can't find that article again. Has anyone heard about this and if you have, do you know what the solution might be?
  6. Steve, Here's a follow on with everything I've tried becaue I have a similar problem but mine only manifests itself at high engine temps. I do all of my own work because I refuse to pay mechanic fees and I had 4 MG's when I was young and leanered alot about cars and motors from those expeiences. There was a problem with the first few years of Boxter with an air leak in the Oil filler tube from the rear trunk to the oil pan. This is said to cause the Check Eng light to come on and also a rough idle. There 's a couple of Press Fit conections I found on top by the intake manifolds. I wrapped them with gorilla tape to seal any potential leaks there. If your problem's at cold temps and you've replace the MAF and the engine side O2 sensors. I'm not sure what else you can do but seal those connections to see if that fixes or helps. The fault codes I see from my high temp probelm is that the fuel injector system seems to loose itself and change the air fuel mixture from lean to rich and then from rich to lean and finally seems to get lost. then the enigne starts to cough. I'm starting to think that it may be vapor locking when the engine gets hot which might be the cause of the air/fuel mixture fluctuations. I remember reading somewhere when I first got the car and vapor lock was mentioned but I can't find that article again. Has anyone heard about this and if you have, do you know what the solution might be?
  7. Steve, Got o OBDCOM.com. You can get a PC based Code reader for under $100
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