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  #1  
Old 07-08-2002, 03:09 PM
Bhill
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'91 190E (201 chassis) 2.6**no start**

Hello--
I am looking at a '91 190E w/2.6L (US) for a friend. Car is currently a no-start (cranks fine). Things that he has done include: replace MAS, check electro-hydraulic actuator current/OK, check timing and Dwell/OK, check Crank sensor/OK, check 4-pin engine coolant sensor/OK, replace coil. My friend says that he can get it to start with ether--I haven't been able to. I checked the Cold start injector-no power to it w/ 10Kohm resistance in place of ECT. I've checked spark--present but appears 'weak'. I've just pulled the distributor cap--it looks 'original'--that is, worn and corroded.

I'm guessing thinking that I have two problems here--weak spark and no cold start.
As the coil has been replaced, I feel that a new cap and rotor are in order. As for the cold start valve, what actually turns it on? The ECU? I know that in slightly older models the fuel pump relay provided power, but with this unit, I haven't got a clue.

If you have any spare clues, they'd be much appreciated.

Bhill
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  #2  
Old 07-08-2002, 03:38 PM
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Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 1,989
What about fuel?

I think there is a fuel pump relay, but there are definatly fuel pumps, two of them. You should hear them run for a second when the ignition comes on. They are located under the drivers side back seat.
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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
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  #3  
Old 07-08-2002, 04:04 PM
Bhill
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Fuel pressure checks ok...

just checked pressure between the two pumps-spec is, I believe 2-4 bar, actual is 45 psi--ok. Also checked fuel pressure at the fuel distributor--also OK.

Thanx

BHill
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  #4  
Old 07-08-2002, 06:37 PM
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Join Date: Jan 2002
Location: England
Posts: 1,841
If you say spark is weak, that's what you want to diagnose first. Do the rotor, leads, plugs (do NOT use platinum plugs) if you haven't already, then perhaps check coil, trigger box etc

later
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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
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  #5  
Old 07-08-2002, 07:37 PM
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Join Date: Nov 2000
Location: Ontario, Canada
Posts: 463
What about charging system?

If the distributor is original so could be the voltage regulator.

These can cause poor running problems and stalling...

Not very much money to replace and it is cheap piece of mind.

Don't even hesitate about the fuses either change all of them for something like 2 or 3 bucks.

Take off your air cleaner and have a look at the throttle body....

How long has the car sat not running?

Take a look at your spark plug wire boots, if they are corroded like mine when I bought my car, change those out and enjoy much better fuel economy and a silk smooth idle.

Good luck and keep us updated.

Mike McKinney
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190E 2.6 - 244 000 km
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  #6  
Old 07-08-2002, 10:08 PM
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Location: southern pines NC
Posts: 35
I just checked my records when I last checked the fuel pressure. The running pressure was 74 psi and the pressure with the car off for 30 minuits was 44psi. If your pressure is only getting to 45 psi max then I beleave that it will not start because the mechanical injectors do not open at that low of a pressure. I have a 92 190E2.6.

Rod
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  #7  
Old 07-08-2002, 10:21 PM
Bhill
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The pressure AT the fuel distributer was about 75 pounds. I checked the pressure BETWEEN the pumps to see if both pumps were working (that is, if the pressure had been low, the #1 pump would have a problem, and if it had been high, then #2 pump would have had a problem).

Thanks--I'm probably going to look at a new cap/rotor tuesday.....I'll keep all y'all posted--I still have to figure out why the cold start injector isn't getting a signal to open.....

BHill
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  #8  
Old 07-09-2002, 01:55 PM
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Join Date: Feb 2002
Location: Florida
Posts: 128
I believe the OVP fuse/10 amp sends current to the cold start. Check this fuse very carefully. On my 90 190E 2.6, I had a very small break in the 10 amp fuse that wasn't immediately seen. Had someone else look at the fuse also and they saw the break.
Also, don't hesitate to replace the rotor and cap.
According to the pressures noted at the fuel distributor, you should be fine. Try using the ether/starting fluid again. I don't see why it shouldn't start with the ether sprayed into the intake.
Depending how long its been sitting, there may be some gunk in the fuel filter. Wouldn't hurt to replace it also.
Keep us all posted as to what you find.
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  #9  
Old 07-09-2002, 08:08 PM
Bhill
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Thumbs up Fixed/thanx to all.

Thanx to all who responded--New cap/rotor fixed it. I have no idea why the cold start injector didn't work, now does--as SHYNE and jay123 suggested, I checked most all the fuses--if these behave anything like the old volvo fuses, maybe just moving them cleared up any problems...
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  #10  
Old 07-10-2002, 08:56 AM
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Join Date: Jan 2002
Location: England
Posts: 1,841
Yes, these MBs always have problems with the fuse connections. I would replace all the fuses in the box with new ones - it gives you peace of mind and will make sure you never have a fuse related problem again (I used to have them all the time before finally giving in and replacing them all).

later
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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
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  #11  
Old 07-10-2002, 12:20 PM
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Join Date: Jun 2000
Location: Saugus, CA USA
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Putting a touch of greese on the fuse contacts will prevent them from corroding and causing related entertaining problems.
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  #12  
Old 07-10-2002, 03:48 PM
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Join Date: Jan 2002
Location: England
Posts: 1,841
Heh.. entertaining indeed, my wiper completely quit while driving in heavy rain

later
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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
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