Well, fixing the vacuum leak really did nothing. It was pretty cold this morning, and took the car a bit longer to start. I did make a new observation though. The car will cold start, the idle is about 1k and then jumps up to 1.5k and then down to 500. That's when the engine stalls and you start it again. After a few times, the idle will jump back and forth from 1.5k to 500 and then finally settle at 1k and keep running. Any insight from this?

Edit: Also, unplugging the EHA when the engine is warm causes no change at all. Yet to determine if this is a faulty EHA, there is some shotty wiring running to it. There are some ugly solders on the EHA connectors and it is tied into the main harness with a wire nut.

that hose that you patched is not vacuum related. In the event the fuel reg. fails, it sends the fuel in to the intake and not on the hot engine.

Buy a mity vac and test while the car is running. 15hg is great. Just FYI vacuum (or lack of) will not solve a hard cold start.

I will admit, your engine may be different than my m103, but on my car the eha valve works when the car goes in to closed loop mode. ( the "E" in CIS-E). None of this magic happens when the car in cold. Once the car warms up, then the eha will (should) start to do something.

Either way, the eha will not help with a cold start problem.

Start with a bottle of redline fuel additive, then give the car a tune up. The problem is not one failed part. It is a lot of parts that are not quite good enough.

__________________
Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

also, proper idle should be 550-650 rpm.

__________________
Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

Well, I picked up a good, used EHA today. We'll see if that makes any difference.

Just while I'm at it, what's the correct timing for this engine?

Any suggestions on getting this idle right?

New plugs, wires, cap, rotor. Make sure you have the right plugs. It will make a difference. After that new motor mounts will almost certainly make a difference too.

__________________
DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV

How would motor mounts effect the idle speed?

Motor mounts won't affect idle speed but they will smooth it up a bit. If the mounts are weak tiny imperfections in the idle seem to magnify.

__________________
DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV

The motor mounts definitely are old, but the idle swings pretty drastically. I replaced the plugs. Haven't done the cap, rotor, or wires yet. I dropped 60 bucks on that EHA to get one locally. Why are plug wires for these so damn expensive?

how is the car running now? Please update.

__________________

1990 190E 3.0L