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I've had a missfire problem under WOT since father's day. It would do it randomly, it seemed. I figured my cat was going bad finally or getting clogged because it wouldn't do it all the time and my cat did have a scraping sound in it. I figured the honeycomb was cracked and i just dealt with it for a few months and figured it was now clogging.
Well the problem become progessively worse throughout last week and I worked a lot of OT last week, and I just dealt with it because the car got me to work and back. It got to the point it is at now: no miss except that slight slight shake it always has had since I bought it at idle, and if I give throttle it misses. However, if I drive it under slight acceleration, its fine except it sounds different now and the whistling sound is more prominent (I'll explain the whistling later). But I give it more than 1/4 throttle, it misses like a mofo and my SES starts blinking.
I bought a new magnaflow cat and installed it saturday. Found out why the old one was rattling, the heatshield had broken off and shook under acceleration. It was fine, well whatever my cat doesn't have that annoying scraping sound anymore. So the cat is eliminated as a problem.
Ok, it must be plug wires. I buy new ones, and the #1 was burned a bit and the #4 end where it connected to the coil pack was rusted. Get the new wires on, and the car just idles better (probably psychological) but the problem is the same. My plugs were replaced at 86k (NGK TR55ix's) and the car has 120k on it now. They're fine.
Got on here and searched, ignition control module and coil packs were the probable cause now. I went to AZ with the coil assembly, they said they could not test our crap..wasn't in their book. Ok, whatever. I bought the ICM. Got back home and installed it, the car now missed ALL the time. I said well f-that, and I was glad I didn't open the bag with the new rubber gaskets, just transferred them over. I put the factory ICM back on, and its way better because at least it doesn't miss at idle or THAT bad. It acted like I had a wire disconnected or crossed wire with that Wells ICM on there.
Now I think, gotta be weak or dead coil. I just bought 3 new coils from Autozone and installed them. Nothing, didn't do jack shizzle. I'm pretty sure I have safely ruled out a spark issue at this point. I'm putting the stock coils back on tonight, and returning the AZ coils.
Here's an explaination to that whistling noise. Back in march, my buddy and I decided to take off the plenum and polish it with the waterneck to match the valve covers that we also polished for G9. Well it took us a weekend, and when I put it back together, it ran like *** at first and I forgot to tighten down the hidden bolt completely as well as one other. I was thinking crap crap crap!!! I torqued them down, and lucklily the car ran fine, with one change: that whistling noise. Its an obviously small vacuum leak, but from either the plenum gasket or throttle body gasket because I left the lower manifold on. I also read something on here about two weeks later and I think magnus had said that little round rubber gasket that is between the plenum HAD to be replaced, regardless of how it looked. I was in a hurry when I was putting it back on (behold, the power of poon ;) ) and I neglected to replace that o-ring.
However, there was no adverse affects in performance or idling, so I thought screw it...and I strongly believe this is coming back to bite me in the *** now. Here's some more background info. The fuel filter was just changed about 500 miles ago before all this starting happening, along with the PCV valve + oil change (I maintain my car well). So it eliminates PCV or fuel filter problems.
Also, saturday when my friends dad was welding my cat and pondering over my car he opened up the radiator cap. My coolant was low, its NEVER low. He rubbed his finger in the radiator and there was sludge...well I haven't had dexcool in there since february when I changed the water pump, put on the ZZP wp pulley and 180* stat. I also used that super cleaner and flushed it completely to get rid of all the dex cool and put in the green coolant. He said the sluge had oil in it...and that he strongly believed that it was ever so slowly sucking in water through the intake manifold. No white smoke out the exhaust or blue...and when I changed the oil, no water in the oil..so the head gaskets should be fine.
Any thoughts before I replace the intake manifold gaskets? In summary, its had a small vacuum leak for months now but never caused harm, no spark issue, miss throughout rpm range under any throttle above 1/4, coolant loss and small amounts of oil in the coolant.
Well the problem become progessively worse throughout last week and I worked a lot of OT last week, and I just dealt with it because the car got me to work and back. It got to the point it is at now: no miss except that slight slight shake it always has had since I bought it at idle, and if I give throttle it misses. However, if I drive it under slight acceleration, its fine except it sounds different now and the whistling sound is more prominent (I'll explain the whistling later). But I give it more than 1/4 throttle, it misses like a mofo and my SES starts blinking.
I bought a new magnaflow cat and installed it saturday. Found out why the old one was rattling, the heatshield had broken off and shook under acceleration. It was fine, well whatever my cat doesn't have that annoying scraping sound anymore. So the cat is eliminated as a problem.
Ok, it must be plug wires. I buy new ones, and the #1 was burned a bit and the #4 end where it connected to the coil pack was rusted. Get the new wires on, and the car just idles better (probably psychological) but the problem is the same. My plugs were replaced at 86k (NGK TR55ix's) and the car has 120k on it now. They're fine.
Got on here and searched, ignition control module and coil packs were the probable cause now. I went to AZ with the coil assembly, they said they could not test our crap..wasn't in their book. Ok, whatever. I bought the ICM. Got back home and installed it, the car now missed ALL the time. I said well f-that, and I was glad I didn't open the bag with the new rubber gaskets, just transferred them over. I put the factory ICM back on, and its way better because at least it doesn't miss at idle or THAT bad. It acted like I had a wire disconnected or crossed wire with that Wells ICM on there.
Now I think, gotta be weak or dead coil. I just bought 3 new coils from Autozone and installed them. Nothing, didn't do jack shizzle. I'm pretty sure I have safely ruled out a spark issue at this point. I'm putting the stock coils back on tonight, and returning the AZ coils.
Here's an explaination to that whistling noise. Back in march, my buddy and I decided to take off the plenum and polish it with the waterneck to match the valve covers that we also polished for G9. Well it took us a weekend, and when I put it back together, it ran like *** at first and I forgot to tighten down the hidden bolt completely as well as one other. I was thinking crap crap crap!!! I torqued them down, and lucklily the car ran fine, with one change: that whistling noise. Its an obviously small vacuum leak, but from either the plenum gasket or throttle body gasket because I left the lower manifold on. I also read something on here about two weeks later and I think magnus had said that little round rubber gasket that is between the plenum HAD to be replaced, regardless of how it looked. I was in a hurry when I was putting it back on (behold, the power of poon ;) ) and I neglected to replace that o-ring.
However, there was no adverse affects in performance or idling, so I thought screw it...and I strongly believe this is coming back to bite me in the *** now. Here's some more background info. The fuel filter was just changed about 500 miles ago before all this starting happening, along with the PCV valve + oil change (I maintain my car well). So it eliminates PCV or fuel filter problems.
Also, saturday when my friends dad was welding my cat and pondering over my car he opened up the radiator cap. My coolant was low, its NEVER low. He rubbed his finger in the radiator and there was sludge...well I haven't had dexcool in there since february when I changed the water pump, put on the ZZP wp pulley and 180* stat. I also used that super cleaner and flushed it completely to get rid of all the dex cool and put in the green coolant. He said the sluge had oil in it...and that he strongly believed that it was ever so slowly sucking in water through the intake manifold. No white smoke out the exhaust or blue...and when I changed the oil, no water in the oil..so the head gaskets should be fine.
Any thoughts before I replace the intake manifold gaskets? In summary, its had a small vacuum leak for months now but never caused harm, no spark issue, miss throughout rpm range under any throttle above 1/4, coolant loss and small amounts of oil in the coolant.
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