my car is idling between 1k and about 1300 rpms and it seems to be running reall rich. After driving it for a little while she starts backfiring and dies. I let it sit for a sec and she fires right back up. Its got a new IAC, i swapped MAFs with a friend, new plugs new wires, swapped the DIS mod, its got a new coolant temp sensor, and its not giving any codes. And every once in a while the tac doesn't work. Any ideas?
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clueless
- Thread starter 89coupe
- Start date
I am definitely no expert, but...
for what it's worth could it be a vacuum leak? You say you are running rich, which could result from air that is being metered at the MAF leaking out - I would think this would cause a rich condition. Your symptoms do sound a little severe (backfiring) for just a vacuum leak, but maybe... I also know that when I had a large vacuum leak (didn't seal my bottom intercooler tube) my engine would start, zip up to 3k rpms and then immediately fall to zero and die.
Again, there is a good chance I am completely wrong about this but hopefully someone will step in and correct me...
for what it's worth could it be a vacuum leak? You say you are running rich, which could result from air that is being metered at the MAF leaking out - I would think this would cause a rich condition. Your symptoms do sound a little severe (backfiring) for just a vacuum leak, but maybe... I also know that when I had a large vacuum leak (didn't seal my bottom intercooler tube) my engine would start, zip up to 3k rpms and then immediately fall to zero and die.
Again, there is a good chance I am completely wrong about this but hopefully someone will step in and correct me...
check the faq forum for a detailed version...
or do a search on "vacuum leaks" or some such. Probably if the car isn't able to really sit there and idle the first thing to do is to visually check all the vital vacuum connections like the upper/lower intercooler tubes, make sure they are bolted tight and sealed. Also the sc top, the vacuum tree near the firewall, and the pcv valve coming out of the back of the passenger side head. If it were a vacuum leak I would assume it would be pretty obvious to be causing these problems. You should also check your vacuum gauge in the car while it is idling and see if it is reading 20 in. Hg or lower, like it should be. If you are getting 20-21 vacuum then I would assume it would be something else.
or do a search on "vacuum leaks" or some such. Probably if the car isn't able to really sit there and idle the first thing to do is to visually check all the vital vacuum connections like the upper/lower intercooler tubes, make sure they are bolted tight and sealed. Also the sc top, the vacuum tree near the firewall, and the pcv valve coming out of the back of the passenger side head. If it were a vacuum leak I would assume it would be pretty obvious to be causing these problems. You should also check your vacuum gauge in the car while it is idling and see if it is reading 20 in. Hg or lower, like it should be. If you are getting 20-21 vacuum then I would assume it would be something else.