Hey everyone,
Let me describe what is going on here and hopefully, someone has dealth with this before and can point me in a direction I haven't thought of.
A friend of mine has an 87 325i convertible. It lost the waterpump on the freeway, blew out all the coolant, but proceeded to keep driving the car until it stopped. I took it all apart and the cylinder head is cracked at #5 coolant jacket. Piston bores look good, no scoring, turns by hand, no problem. Sourced new complete cyl head, installed along with new pump, belts, etc. Now, the problem: it will not idle or stay running at all ... in order to even think about turning it over, you have to crank with the accelerator pedal buried to the floor at which point it will barely start, run like complete shit, and send just clouds of smoke out the tail pipe. I have tried the following:
Swapped all the following parts from another well running car (mine ;D)
- FPS
- MAF
- Crank Sensor
- TPS
- 2 sets of plugs (bosch and ngk)
- DME
- Coolant temp sensor
- Run the valves at .010
- Torn the front timing covers back off and made sure timing was dead on
- Distributor cap and rotor are relatively new (>6mos) and look fine
- Compression is 125 across all cylinders
- Fuel return line is clear
In addition, when I took the potentially suspect parts off, I put them on my car and ran it. All work fine, so I can deduce that all parts are functional.
I thought it may have been due to a plugged cat; I dropped the down pipes at the headers and tried to turn the engine over. Nope - same barely running condition, just a lot louder.
I have another set of plugs coming as I think these are now fouled beyond running in a good car for cleaning. I'm running out of options here and hope someone can give a few pointers.
Thanks,
Sean
Let me describe what is going on here and hopefully, someone has dealth with this before and can point me in a direction I haven't thought of.
A friend of mine has an 87 325i convertible. It lost the waterpump on the freeway, blew out all the coolant, but proceeded to keep driving the car until it stopped. I took it all apart and the cylinder head is cracked at #5 coolant jacket. Piston bores look good, no scoring, turns by hand, no problem. Sourced new complete cyl head, installed along with new pump, belts, etc. Now, the problem: it will not idle or stay running at all ... in order to even think about turning it over, you have to crank with the accelerator pedal buried to the floor at which point it will barely start, run like complete shit, and send just clouds of smoke out the tail pipe. I have tried the following:
Swapped all the following parts from another well running car (mine ;D)
- FPS
- MAF
- Crank Sensor
- TPS
- 2 sets of plugs (bosch and ngk)
- DME
- Coolant temp sensor
- Run the valves at .010
- Torn the front timing covers back off and made sure timing was dead on
- Distributor cap and rotor are relatively new (>6mos) and look fine
- Compression is 125 across all cylinders
- Fuel return line is clear
In addition, when I took the potentially suspect parts off, I put them on my car and ran it. All work fine, so I can deduce that all parts are functional.
I thought it may have been due to a plugged cat; I dropped the down pipes at the headers and tried to turn the engine over. Nope - same barely running condition, just a lot louder.
I have another set of plugs coming as I think these are now fouled beyond running in a good car for cleaning. I'm running out of options here and hope someone can give a few pointers.
Thanks,
Sean
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