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2003 C2
Purchased car in November 20 with 48k miles. Now has 52k. Posted before about my P300, P301, P302 and P303 misfires only on startup. Happened about one in ten or twenty starts. Took advice from the forum and just got my Durametric. Last night for the first time ever engine lugging when accelerating. Ran fine at cruise. Pulled over and restarted and drove fine 25 miles home. Hooked up Durametric (see photo) when got home.
This morning hooked up Durametric and started. Saw immediate misfires on cylinders 1, 2 and 3. Ran fine for half a mile and start lugging. I had my laptop on the passenger seat with Durametric running checking misfires on all cylinders. Misfires on other bank for the first time. Pulled over. Cranks but won't start. Not even firing.
Scary part. I posted a few weeks ago about my water pump replacement saga that just turned out to be a hose on the front of the engine. Know coolant was full after that work because went through cycles and checked for several days later. Coolant this morning was about an inch under minimum mark. Topped off.
Something similar happened to me in a 997. Air pocket was left after coolant change and eventually led to cracked cylinder after many many heat cycles. Got misfires at first, then eventually hydrolocked. Hope you arent facing the same fate. Best of luck.
Something similar happened to me in a 997. Air pocket was left after coolant change and eventually led to cracked cylinder after many many heat cycles. Got misfires at first, then eventually hydrolocked. Hope you arent facing the same fate. Best of luck.
Misfires on cylinders 1, 2, 3 were going on long before the coolant change, so hopefully not that. But, that does not explain the misfires on the other bank. Coolant not completely drained when changed water pump and I followed the rev up / fans on procedure religiously. Will coolant from a cracked head show up when I pull a plug or with a bore scope? I had a 740iL with a cracked head and oil got milky/frothy. Oil in the 996 looks fine.
I’m not qualified to answer that. I had my car flat bedded to my indy and i believe he saw coolant in a cylinder when he removed the plugs. Again that wasnt a M96 engine so hopefully your situation is different from mine.
Your model year has Vario cam plus. If I had to guess your lifters are failing.
You will need to check the compression. Or perform leak down test to verify.
Check all the clamps on the coolant hoses/lines - there are a lot of them and they generally only leak when the car is hot (full pressure). It could also be the tank - even though it was replaced recently... Once you figure out the leak, replace your coils to see if the misfires go away.
Check all the clamps on the coolant hoses/lines - there are a lot of them and they generally only leak when the car is hot (full pressure). It could also be the tank - even though it was replaced recently... Once you figure out the leak, replace your coils to see if the misfires go away.
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Misfires, now won't start, HELP!
