430 Engine Miss
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I am experiencing a 430 engine miss. Vehicle has 70 K miles and miss began at about 60 K. It occurs with light throttle input w/wo cruise control on slight inclines. Will also occur from a stop on level ground. Serviced every 5 K at dealership since new. Stock except for K&N air filter. Had induction service with no change in engine miss. Any ideas out there?
#2
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I am experiencing a 430 engine miss. Vehicle has 70 K miles and miss began at about 60 K. It occurs with light throttle input w/wo cruise control on slight inclines. Will also occur from a stop on level ground. Serviced every 5 K at dealership since new. Stock except for K&N air filter. Had induction service with no change in engine miss. Any ideas out there?
Buy a can of CRC MAF cleaner at autozone, remove your MAF, and clean the hot wire within the MAF with CRC cleaner. Or better yet, just replace the MAF, its only $120-150, depending which dealer you go to.
What happens is, your MAF, which is immediately after the filter in the intake piping, has a hot wire that is heated to 400 degrees, and the oil from the K&N filter bakes onto it, and all the tiny dust/dirt particles that get through the filter stick to that oil, and your MAF no longer reports the correct air quantity to the computer, and the computer in turn sends the wrong amount of fuel to the engine, and thats why you're having a miss.
I had exact the same problem with my GS430. I don't know how that crooked K&N company still hasn't been sued off the face of the earth.
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^
nope that is due to POOR USER re-oiling. i've had mine on since i bought the car and since then i have put on 20k miles and guess what? no problems with my MAF. ive also cleaned it 3 times already, done properly.
back on topic though,
Habu4, it does sound like something ignition related, spark plugs or spark plug wires fouled up could cause this. are u mechanically inclined to be able to remove the spark plug wires?
nope that is due to POOR USER re-oiling. i've had mine on since i bought the car and since then i have put on 20k miles and guess what? no problems with my MAF. ive also cleaned it 3 times already, done properly.
back on topic though,
Habu4, it does sound like something ignition related, spark plugs or spark plug wires fouled up could cause this. are u mechanically inclined to be able to remove the spark plug wires?
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Which car do you have your K&N on? If its on your LS, then it wont cause problems, early LS does not use a hotwire MAF.
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The K&N filter has been installed on my 2003 SC430 for about 20K miles. Would not ignition problems be more inclined to to cause an engine miss thoughout the power range? Dealer can duplicate the problem but not find the cause.
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I know on the 96+ Toyotas, the MAF was changed to a wire device, which gets gummed up by the oil from K&N filters. I'd clean the MAF and stick w/ the factory airbox. The only proven difference w/ the K&N vs. OEM is it allows more dust into your engine, meaning accelerated engine wear. You ought to have your oil tested and check the silica levels to verify.
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I'm glad I didn't put a K&N filter in my car after reading all of this. I didn't think about how all that oil would would affect things beyond the filtration. Thanks
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Get rid of that K&N filter.
Last edited by Jabberwock; 04-28-10 at 06:46 PM.
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In 98 I bought a brand new Mustang Cobra. installed a K&N almost immediately. At the first service the service manager at the FORD dealership told me that a K&N filter could void the warranty. After laughing in his face I showed him the Ford Speed Parts catalog and asked him what kind of air filter was recommended in the book. Of course it was a K&N and at that point the filter stayed and he never mentioned it again for 10 years that i had the car serviced there.
Back to the thread..the Cobra exhibited the same symptoms the OP has at about 58000 miles. It was the fuel pump.
Back to the thread..the Cobra exhibited the same symptoms the OP has at about 58000 miles. It was the fuel pump.
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In 98 I bought a brand new Mustang Cobra. installed a K&N almost immediately. At the first service the service manager at the FORD dealership told me that a K&N filter could void the warranty. After laughing in his face I showed him the Ford Speed Parts catalog and asked him what kind of air filter was recommended in the book. Of course it was a K&N and at that point the filter stayed and he never mentioned it again for 10 years that i had the car serviced there.
Back to the thread..the Cobra exhibited the same symptoms the OP has at about 58000 miles. It was the fuel pump.
Back to the thread..the Cobra exhibited the same symptoms the OP has at about 58000 miles. It was the fuel pump.