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Discussion summary
YOUR RESEARCHMisfires, now won't start, HELP!
Reported or suspected cause
hose
Reported cause
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1
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Reported cause · Original poster
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.
Leading evidence: 'hose' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'hose' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check cam deviation' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Know coolant was full after that work because went through cycles and checked for several days later.
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Performed · outcome unconfirmed · Original poster
This is the hose that was replaced a few weeks ago after first replaced water pump before figured out this was the leak.
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Performed · outcome unconfirmed · Original poster
The hose behind the belt is what was replaced in the first picture with a finger.
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Performed · outcome unconfirmed · Original poster
This is the hose that was replaced a few weeks ago after first replaced water pump before figured out this was the leak.
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Suggestion
If its the back of the motor by the water pump there is a coolant hose junction just under the oil fill, bolted to the block behind the belt, which will vrack and leak down the block.
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22 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
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.
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.
This is the hose that was replaced a few weeks ago after first replaced water pump before figured out this was the leak.
Got underneath to pull the plugs and saw:
No drips, but wet. Has been sitting since Thursday morning
Coil cylinder 3 - definite drip I know this wasn't there when replaced water pump
Variocam? by cylinder 3 - definite drip I know this wasn't there when replaced water pump
Definite drip
No drips, could be left over from prior leak
Coil cylinder 1 - definite drip I know this wasn't there when replaced water pump
Driver's side back of engine were mates to transaxle
Above driver's side bank. Wet.
After replaced the water pump, I pressure tested the system. No pressure drop. As said, the coolant tank is new (still nice and white).
Ideas?
Is the air/oil separator water cooled?
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.
Sorry for being a newbie, but I don't know what is leaking. Pointed finger shows where drips are hitting floor. Second picture shows coolant dripping around hose clamp. Looking at lot of diagrams online, but can't figure out what this hose in connected to.
You could have a loose or broken hose clamp, or an over tightened hose clamp that compromised the hose. Start with the simple things first. Are these pics with a borescope? If not get one, best $30.00 you'll spend on a tool.
Get the area all cleaned up and start fresh.
I have a rental tool borescope. Took pic with iPhone holding UV flashlight in other hand. Didn't see much more with borescope. Still trying to figure out what it is. Air oil separator? Can find a good diagram of the driver's side back of the engine online?
I can tell what i am looking at. Take a pic from a little further back. If its the back of the motor by the water pump there is a coolant hose junction just under the oil fill, bolted to the block behind the belt, which will vrack and leak down the block. Here is a good replacent.
https://www.fcpeuro.com/products/por...RoC9JoQAvD_BwE
I call where the serpentine belt is the front of the engine. I call where the engine mates to the transaxle the rear of the engine.
The hose behind the belt is what was replaced in the first picture with a finger.
The new leak is dripping to the floor at the second picture with a finger. Location of finger is drivers side where engine mates with transaxle. Drip starts way high up to the driver's side.
Your AOS coolant hoses or the AOS itself is leaking. My AOS housing cracked and leaked coolant. Drivers side of engine, way up on top. Good luck...it is one PITA job to replace.
