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Old 03-08-2003, 08:08 PM
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fuel cutting off 1991 190e 2.3

After rebuilding and reinstalling the motor in a 190e 2.3 8v. 1991 the car will start and run for about 7 seconds. A new fuel relay was bought but didn't cure the problem. There is good fuel pressure and if you jump the relay the car will run. However the timing can't be adjusted by turning the dist. and the tach doesn't work. I only have a manual up to 1988 and I have a bosch manual that I've been using to fix the problem. These say that the functions that are giving me trouble are related to the voltage relay. Is this true? Can I test this relay and how might I do this? If any other suggestions I'm all ears. It's starting to get to me so any help will be appreciated. Thanks in advance.
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Old 03-08-2003, 11:44 PM
Registered User
Join Date: Sep 2002
Location: lynchburg, va.
Posts: 60
I had a similar problem on my 86 190. Check fuse # 10 in your
fuse box. Also check fuse on overvoltage protection relay.
If the fuses are OK, make sure they have a good connection.
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Old 03-09-2003, 09:45 AM
Registered User
Join Date: Oct 2002
Location: Toronto, Canada
Posts: 700
if you jump the fuel pump relay it works but if you leave it in it does not.

tach signal is also sent from fuel pump relay so something has to be wrong in that area, check the connectors, expecially if it's a new relay.

I think that if it was the fuse pump would do the same even if jumped. I know i had to clean all of my pins when i got my car, didn't fix anything for me, but I imagine it would in a case like this.

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Old 03-09-2003, 09:57 AM
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I checked all connections so they all seem good. there are three relays behind the battery. One is the fuel pump the other with the fuse, I assume, is the voltage relay but what is the other one? I checked resistance on the td wire freom the ign module to the relay and it's good. how can I check the ign modul itself?
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Old 03-09-2003, 10:07 AM
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One other thing, my check engine light is on . Can I check an engine code to help solve the problem and if so how might I do this/ Thanks
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Old 03-10-2003, 10:49 PM
Registered User
Join Date: Sep 2002
Location: lynchburg, va.
Posts: 60
I am not sure if 91 190e has engine fault code scanner built in the
ECU. I think you need a special diagnostic tool, you really need to
post this qestion, I am sure there are experts in the field who
can help you. The three relays you are asking are, fuel pump,
AT kickdown and overvoltage protection relays. The OVP relay
is the one with 10A fuse. Meantime when you will be waiting
for answer to your question on engine fault codes, you can try
qucik couple of tests. One, you need to test OVP relay, second
test engine idle stabilization.
OVP test.
1. Disconnect battery,
2. remove ECU and disconnect plug.
3. Reconnect battery
4.Switch -on ignition, engine off, Test voltage from control unit
plug to termnal 1 to ground.
If there is a battery voltage present, end of test. OVP relay is OK
If there is no battery voltage you need to stop here. Send me a
private e-mail how can I fax you a copy of the rest of the procedure.
Engine Idle Stabilization test.
1. Ignitin on, engine off.
2. Gear shifter on P and N
3.Check voltage between ECU plug terminal 16 and battery.
If there is battery voltage present, OK. End of test. If not,
check Safety Neutral Switch, or repair broken wire between
ECU and SNS. This is only a partial procedure. If you a find
problem with idle stabilization let me konw.

Last edited by kjsabat; 03-10-2003 at 10:58 PM.
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Old 03-12-2003, 07:30 PM
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Thanks kjsabat, The problem seems to be in the td signal. I have voltage present at the td diagnostic terminal screw but not at the fuel pump relay. I tested the large green wire in the ign control mod but got no reading. I need to know how to completely test out where I,m losing the td signal. Any help would be greatly appreciated thanks.
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