This problem is driving me crazy. I overhauled the engine but it took me over a year. Now it runs fine, compression is over 150 on all cylinders, but this code won't go away and I can't pass emissions to get a new tag! As I said it runs fine and no black smoke from the exhaust. The manifold vacuum is a bit low at 15 but I cannot find a leak. Sometimes I get an ignition misfire code but it may be be because it runs so rich. Plugs are all black though #2 is slightly less so. I thought I had found the problem because though I have voltage to the mass airflow sensor it reads higher while running than the manual says it should, only slightly lower than when running. So I had a bright idea and I separated the hose between the MAF so that some of the air bypassed the sensor. I did not get the codes this way while running in the driveway. Also the maniflold vacuum came up to just under 16. I am guessing it was still a bit rich or maybe went lean but not enough to set off the computer. I am guessing the IAC has to crack open a bit more causing the low manifold vacuum. I cannot find any component that measures the vacuum pressure so I think I am done looking for leaks. Could the computer have lost the correct settings or something?
Oh, I replaced the MAF but it does the same exact thing. But when I replaced it, there was a warning that the warranty was void if I did not reuse a rubber seal on the connector. Apparently that went missing during the rebuild somehow. Can this be because of a stupid dust seal? I hate to drag it into a shop and have them do a $100 plus diagnostic and then find out it is because of a $5 part.
BTW is there an OBD tool that will tell me how rich lean, and the tables etc without costing an arm and a leg? I guess I could spare a few fingers.
have the same problem?
Thursday, August 7th, 2008 AT 12:11 AM