Help With Parts List -- M42 Intake Manifold R&R...

[Ben Carufel]

Hey folks,

My '91 318i has about 275,000 miles and there are currently two issues which bug me: an on-again/off-again fuel leak (no drips, only smells) and a stalling problem.

Kellie has a suspicion that the fuel leak is under the intake manifold somewhere, and in any event there are a few hoses (vacuum and otherwise) in that area showing signs of cracking, so we've decided to pull the intake manifold and replace all of the gaskets/hoses/etc. next weekend.

I'd appreciate suggestions you guys may have as far as seals/hoses/etc. to replace "while we're in there". I know next to nothing about M42s, as all 8 of my previous E30s have been M20s.

Thanks!

Ben

[Van Westervelt]

Be sure to do both the intake gaskets. On one of mine had a fuel leak under there. There are 2 sections about 30-40mm of fuel line. Common leak on m42s. Check and clean or replace the ICV too.

[bmwpower]

Good time to do the coolant hose bypass.
Check all the vacuum hoses in that area.
Check the pastic coolant pipe for leaks.

[e30 Luv]

I just did this about a month ago. Here's a good thread on deleting the Throttle Body heater along with the unnecessary hoses that tend to cause leaks.

http://www.m42club.com/forums/showthread.php?t=2742

And here's some pictures of how I ran mine. I used mostly stock replacement vacuum lines with a couple changes for the delete.

http://www.m42club.com/forums/showpost.php?p=58145&postcount=11

Most likely every vacuum line will need to be replaced:
Crankcase to TB
ICV to Intake Boot
FPR to TB

Black Plastic coolant pipe too!

You may also want to get a new TB gasket (or 2 if you don't delete heater plate). Also a good time to inspect all the wires in the black plastic box beneath the manifold.

Realoem E30 318is

[golde30]

woohoo, the rats nest... replace all those crazy hoses under the intake mani, and replace both the gaskets on the 2pc intake manifold. also, i never seen an m42 that didnt have a cracking intake boot.

[Ben Carufel]

Thanks guys. Any more suggestions?

[bmwpower]

Take out the injectors and have them cleaned & checked.

Delete that factory coolant check valve against the firewall...known for failure.

[e30 Luv]

Delete that factory coolant check valve against the firewall...known for failure.

Which one is this?

[bmwpower]

Which one is this?

This one:

http://www.realoem.com/bmw/showparts...35&hg=64&fg=99

They're calling it a thermostat.

[///M42 sport]

http://m42club.com/forums/showthread.php?t=6334

I did a pretty basic writeup replacing all the cooling hoses.