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Old 07-20-2007, 10:47 PM
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Join Date: May 2007
Posts: 28
92 300e 2.6 no idle after head gasket R+R

I'm going to try to include everything doen, so there is little confusion. Car is a 92 300e with the 2.6 M103. Bought it with the telltale head gasket leak, oil in coolant, but it was running, just overheating. I learned enough from this site and others to delve into the project, but in the process busted part of the timing chain guide rail, so lower timing cover had to come off also. New parts include :Valve guides and seals when head was checked and machined, new headgasket, new timing chain, new head bolts, new chain guide rails, new crankshaft and camshaft seals, new belt tensioner, new belt, new plugs, new wires, new dist cap, new ignition rotor. Upon reassembly I timed it correctly according to instructions I found on this site.
Anyways, car starts if you apply throttle while starting, runs as long as you continue applying throttle, dies instantly when you let off the throttle. Sounds like a timing issue to me. I also noticed a small oil leak, but it could be vc gasket, not sure yet, as it hasn't run but for very short time bursts. I have read about other idling issues, but as it ran and idled before, I would think its something I tampered with, such as timing. Oh, and I left the intake and exhaust manifolds in place upon head removal, so there was minimal disturbance to them. Any ideas?

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Old 07-20-2007, 11:51 PM
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Join Date: Apr 2001
Location: Joliet Illinois
Posts: 309
Rough Idle

A few things you might want to check are:

Are ignition wires connected to distributor in proper order?

Are there any vacuum hoses leaking? The hoses to the idle air control valve get brittle with age and could have cracked when disconnecting the manifold.

Another possibility that I hate to mention is that the timing chain could be off a link. Are you sure that the chain was installed with the crank and cam in the correct position and without too much slack in the chain?
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Old 07-21-2007, 07:18 PM
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Join Date: May 2007
Posts: 28
Yeah, I'm leaning towards the timing chain being off a link, apparently its not off much, as it does run, but not well. I aligned the mark on the cam to TDC with the mark on the harmonic balancer halfway between the 10 and the 0 marks, as a thread on this forum stated was the correct process. Does anyone have the actual technical writeup of how to properly set the timing. I thought it was strange that the hall sender is what the harmonic balancer lines up with, but it is somewhat adjustable on its own, probably three degrees or more either way. Can anyone explain the process with more clarity to me?

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