Violent missing
07-12-2008, 06:12 PM
#1
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Violent missing
I was riding along today the car was running fine and all of a sudden a terrible miss. It was so bad I almost couldnt get off the road, it felt like it was running on 2 or 3 cylinders. I open the hood and find nothing obvious. I start it back up and the engine is shaking like crazy obviously missing on several cylinders or getting no fuel. So as I try to think of the closest tow truck the engine smoothes out and the miss is gone. I drive it home without skipping a beat. What the heck could cause something that bad then clear up and run fine.
Thanks, Tim
Thanks, Tim
07-12-2008, 07:24 PM
#2
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Check for corrosion on the plug wire terminals, coil wire terminal, and the two Opti harness connectors.
Scan it. Whatever caused the problem may have set a code, and the code would still be stored.
Check the fuel pressure. When was the fuel filter changed last?
Scan it. Whatever caused the problem may have set a code, and the code would still be stored.
Check the fuel pressure. When was the fuel filter changed last?
07-12-2008, 09:25 PM
#3
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I checked the fuel pressure it seems fine, 43psi with just the key on and 41psi idleing. The fuel filter was changed about 5000 miles ago. I checked for codes and found 42 and 48. I am just not sure if the codes caused the miss or the miss caused the codes. After i cleared the codes they have not came back. I did put a new msd coil and wires on about 2 weeks ago. I checked them and everything seems fine.
The car is running fine now. I am afraid to drive it though. Any Ideas
The car is running fine now. I am afraid to drive it though. Any Ideas
07-13-2008, 01:09 AM
#5
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DTC 42 = a short/ground in the IC Module dircuit
DTC 48 = a fault in the MAF sensor circuit
A "miss" can't cause a short or faulty circuit. A short or faulty circuit can cause a miss.
DTC 48 = a fault in the MAF sensor circuit
A "miss" can't cause a short or faulty circuit. A short or faulty circuit can cause a miss.
07-13-2008, 05:17 PM
#7
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Today the car just dies while idleing, no warning or missing it was like you turned off the key. At first it wouldnt start back. So I checked the coil for spark, it seemed fine. So i go to the plug wires to check for spark. Well the car starts right up. While its running I notice the coil wire is arcing pretty bad against the water pump. There was a small rip in the top of the boot. Could this have caused the bad miss, no starting, and throwing the codes? Or should I keep searching for the problem?
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