Engine stalls when placed in gear (when engine warm) problem? - Page 2 - PeachParts Mercedes-Benz Forum

raymr · #16 02-03-2006, 11:58 PM

Did you unplug the ICV with the engine running? Actually you can unplug it with the motor off. When you restart it, you should see the idle RPM go up.

When my dad owned the car, he said it stalled out at weird times, usually while slowing down to take a turn. The prior owner got rid of the car for that reason. It happened to me once in front of my house.

I did discover a loose connector on the module behind the passenger side kick panel. It was only attached half way. I pushed it back on tight and it never stalled since. But I can't say for absolutely sure that was the cause.

86560SEL · #17 02-04-2006, 01:14 AM

My symptoms or his?

My car supposedly has a nearly new fuel pump. Is the relay seperate?

QUOTE=Col.Klink]Your symptoms sound like a classic example of the fuel pump relay going out ....[/QUOTE]

86560SEL · #18 02-04-2006, 01:16 AM

Thanks. No, I have not tried it yet, but I will on my nexy day off (Tuesday).

Mine has not yet stalled when turning, but only when coming to a stop. Sometimes it runs fine at stops. Very sporadic. It never seems to do it on my first trip out for the day, but if I come back home, then out again, it usually stalls at least once in town.

I will also check that connector you mentioned.

Quote:

Originally Posted by raymr

Did you unplug the ICV with the engine running? Actually you can unplug it with the motor off. When you restart it, you should see the idle RPM go up.

When my dad owned the car, he said it stalled out at weird times, usually while slowing down to take a turn. The prior owner got rid of the car for that reason. It happened to me once in front of my house.

I did discover a loose connector on the module behind the passenger side kick panel. It was only attached half way. I pushed it back on tight and it never stalled since. But I can't say for absolutely sure that was the cause.

420 SE · #19 02-04-2006, 01:27 AM

G'day 86

Yes the fuel pump relay is separate, it's one of those silver boxes in the fuse box.

Have you got yourself one of those $30 service CDs from MBUSA? They are invaluable - although don't have everything (transmission) they help a lot, if just to identify things.

Cheers

86560SEL · #20 02-04-2006, 09:02 AM

Thanks. Sounds like I need one of those CD's.

Off to work I go.
Carry on.

Thanks again.

newr · #21 02-10-2006, 07:23 PM

It happened again last week. Engine stalled when put into gear D or R (note - I do not have problem stalling while driving or comming to a stop)

Whenever it dies when shift into gear D or R, I also notice little rough idle and if i give it a little gas, engine would stalls out. Now, if I let it runs for few minutes until the idle smooth out, then engine will not stall when shift into gear D or R.

I also have couple other problems that may or may not be related.
1. Sometime engine stalls immediately after it starts.
2. High idle (1000RPM) when gear in P or N. 700RPM when in D or R.

I decided to have the pro check it out instead because I am tired of this guessing game. I just want to solve it quickly and sleep in peace instead of monkey around with it until I get it right. I also don't want to be stranded on the road down the line.

Before I brought it to the indy shop. I replaced the fuel pump relay and still stalls when shifts into gear D or R.

Here is the diagnostic from my indy shop for the problems
1. Engine stalls immediately after starts
2. High idle
3. Sometime engine stalls when shift into D or R.

Indy - Checked fuel pressure and tested idle control system. Indy recommended replacing idle control unit, idle control valve (sometime sticking) and overload protection relay.

I have all those stuff from a part out car except for the OVP so the indy replaced the OVP. I will clean out the ICV and replace the idle control unit and see what will happen.

I will report back to let you know what I find. Hope someone with the similar problem will find this thread helpful in the future.

newr · #22 02-10-2006, 07:25 PM

86560SEL, the fuel pump relay is right next to the OVP.

86560SEL · #23 02-11-2006, 12:49 AM

Thanks. Yeah, if you find anything else out let me know. Ironically my car has not stalled out again- when placed in gear, or even when stopping the past two times I have driven it last. I have other cars, so I only drive this one about two to three times per week. I am still using caution however at stop signs and traffic signals, as I come to a stop slowly, to be sure it does not have a chance to stall @ a stop. It has only did this twice, but it is frustrating. Seems like both times, it stalled when it was "upshifting" back into 1st gear- the idle goes up a little you know and when it goes back down, it seems to go down too far- then it stalls, but immediately starts back up and runs smoothly.

Sometimes with my idle- it will idle around 900 rpms when in park, but most of the time, about 700-750. When in drive- mostly 500-550 rpms, but sometimes about 700 (when it idles 1000 in park).

So far, it is not a big deal, but I am guessing it may only get worse.

Good luck to you! Keep me posted. Thanks again!

newr · #24 02-24-2006, 06:05 PM

Update

After the Indy replaced the OVP, I no longer have the stalling problem when put in gear D or R.

So I still had 2 problems –
1. High Idle (1000RPM) when gear in P or N. 700RPM when in D or R.
2. Engine stalls immediately after start. It starts fine after a few attempts.

Here was my quest.

I replaced the Idle Control Unit (ICU) with another used one I had laying around and it did not make a difference. Actually, it was even worse. The idle kept fluctuating up and down and then eventually stalled… many times. So I put back the original ICU.

So I soaked and cleaned the ICV pretty good. I also noticed clicking sound like something was lose inside the ICV when I shake it a little. Anyway, after a good cleaning, I reinstalled it and the high idle was gone. After driving around for a few miles, I noticed the high idle came back up and this time it was worse than before. Idle was 1500 in P and 900 in D or R. I guess I killed it.

I replaced the original ICV with a used one, and this time the idle stayed at 650RPM in P and 550-600RPM in D. So I guess I’ve solved the high idle problem.

I still have one last problem – Engine stalls immediately after start. Sometime it goes like this when I start the car. Right after it starts and release of the key, the RMP would go up to about 1500 right after start then drops right down to 100-200 RPM like it would just drop dead, then shoot back up 800 RPM then becomes stable at around 650RPM. The entire process takes about 3 seconds when idle becomes stable.

I ordered and installed a new ICU and did not really notice anything. Except that when it stalls immediately after start, the second try ALWAYS start her right up. Previously I may have to try a few times.

Do you have any idea with my last problem?
Thanks

dkveuro · #25 02-24-2006, 06:25 PM

Quote:

Originally Posted by newr

Update

I still have one last problem – Engine stalls immediately after start. Sometime it goes like this when I start the car. Right after it starts and release of the key, the RMP would go up to about 1500 right after start then drops right down to 100-200 RPM like it would just drop dead, then shoot back up 800 RPM then becomes stable at around 650RPM. The entire process takes about 3 seconds when idle becomes stable.

I ordered and installed a new ICU and did not really notice anything. Except that when it stalls immediately after start, the second try ALWAYS start her right up. Previously I may have to try a few times.

Do you have any idea with my last problem?
Thanks

There was a problem with this on 201 124 and 126 's..........
There's a Bulletin # DD07.3-90071. Engine Shakes At Idle.

This suggests checking continuity of socket 16 of CIS-e control unit (N3.) to connector X26 pin 10....this might apply to your situation..it's the gear selector recognition circuit.

Must also check frequency control is in factory spec's as correction by the ECU will cause hunting idle speeds.

.....I 'spose you checked all the simple stuff like plugs/wires/cap/rotor etc ?

.