Author Topic: Help.. i just replaced my head gasket .... (Read 3181 times)

mtelman · « **on:** October 08, 2011, 03:44:43 PM »

Well i replaced my head and head gasket. it took a long time but all seems to have went well. but now when i start the car it races to red line and i turn off the key... some one said it might be a vacuum leak but how to find it if i can not start the motor???

And input would be welcome... help please

mtelman · « **Reply #1 on:** October 08, 2011, 03:45:33 PM »

oh sorry.. its a 1990 318i sedan... with of coarse the M42 motor...

wazzu70 · « **Reply #2 on:** October 08, 2011, 07:36:47 PM »

A vac leak won't make it rev to redline. The engine shouldn't have the right timing to do this with the throttle plate closed.

Make sure all your sensors are plugged in, especially the TPS. I would also disconnect the throttle cable so you know its not holding the throttle WOT.

Warsteiner · « **Reply #3 on:** October 08, 2011, 07:49:38 PM »

I second what NickHertlein said!

~Ralph

DesktopDave · « **Reply #4 on:** October 09, 2011, 10:14:17 AM »

Yep...TPS or AFM switches...or even a binding throttle cable. BMW issued a recall that added a little clip to fix a cracked tube on the TB bracket adjuster.

monty23psk · « **Reply #5 on:** October 09, 2011, 09:47:18 PM »

longshot, but stuck accelerator cable.

Isamemon · « **Reply #6 on:** October 10, 2011, 10:00:38 AM »

well Ill throw a kink into it

Ill go wiht a throttle cable issue, not the TPS

my reason, my TPS went bad a few months ago, I unplugged, it. Car runs great, fuel economy still good.

However

timing chain has got the car parked for a few weeks, when I replace the chain etc, ill replace the tps and other misc things Ive put off

chain did not snap or anything, just too noisy and dont want anything to break

DesktopDave · « **Reply #7 on:** October 10, 2011, 04:03:31 PM »

Check the idler gear bearing along with the guides & tensioner. They're all weak spots, BMW updated them all in later M42's & '44's.