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Old 12-31-2006, 02:48 PM
jodeven jodeven is offline
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Join Date: Oct 2006
Posts: 25
Help! - 86 420SEL Idle misfire after timing chain guide replacement

Hi Folks,

Well got the car running, however, Idle is not so good. Feels like rapid misfire - (high frequency) at idle. Off idle engine runs fine. Power seems okay - I think. I may be paranoid and it may be down as well.
Off idle the engine seems smooth. -no misfires. Full throttle no misfires.

Everything I did is as follows.

Guides
Tensioner
Spark plugs
Ign Wires
Belts
Cam Oilers
v. cover gaskets.

The spark plugs are Bosch Super WR8DC+ gaped at .032 thousands.

I lost time when replacing the guides. Spun the motor by hand and the pistons and valves were interfering. So I removed the rockers and retimed motor. I don't know if this is a problem but when I got the crank and the right cam lined up to marks the left cam is now 1/2 tooth retarded. Before I began the repairs I set the motor up at TDC and all marks lined up. I don't know what changed - why I now have the left cam 1/2 tooth off.

Ran compression test all cylinders on left side were at 160 psi. The right side was 165 - 175.

Can anyone give me an idea. Is the spark plugs the resistor type and causing the problem? or do I have a valve timing issue? or something else?

Thanks,

Joe

Last edited by jodeven; 12-31-2006 at 02:49 PM. Reason: correct title
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