??Problems with my 1990 740

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Old 11-17-2007, 09:50 AM
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Default ??Problems with my 1990 740

Ok the problem is the car sometimes start sometimes don't when running the car stalls or when on idle. No check engine light I can hear the bomb perfectly the coil has spark but on the ignition cap if I play with cable that goes from the coil to the ignition it start misfiring how do I know its the ignition cap its going bad any help would be aprreciate it

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Old 11-17-2007, 09:57 AM
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Default RE: ??Problems with my 1990 740

I would do a full tuneup and take it from there.
 
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Old 11-17-2007, 09:59 AM
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Default RE: ??Problems with my 1990 740

Sounds like the coil wire is bad. It's possibly arcing to ground, so be carefull you dont get shocked!
 
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Old 11-17-2007, 10:00 AM
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Default RE: ??Problems with my 1990 740

That car has everything I put new spark plugs less than one month air filter, gas filter, even rebuilted the tranny less than a month and now this??? any ither suggestions???
 
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Old 11-17-2007, 10:10 AM
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Default RE: ??Problems with my 1990 740

You did new cap,rotor, and wires?
If so are they good quality?
 
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Old 11-17-2007, 04:03 PM
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Default RE: ??Problems with my 1990 740

Ok the car has good spark on all four pistons,cap and rotorok, I can hear the fuelpump noise under the car so I Sprayed some carburator cleaner in the throttle and the car tried to start but didn't stay onDon't know what could be causing this. !!help please
 
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Old 11-17-2007, 04:20 PM
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Default RE: ??Problems with my 1990 740

If the Carb cleaner started it then it stopped it means not getting fuel.
Could be injector relay or speed sensor.
 
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Old 11-18-2007, 07:40 AM
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Default RE: ??Problems with my 1990 740

Tech Where are this items you mention located in the car???
 
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Old 11-18-2007, 07:58 AM
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Default RE: ??Problems with my 1990 740

The injector relay should be on the passenger side attached to the coolant bottle.
You might have 2 of them there. One is a cooling fan and the other is the injector relay.
The speed sensor is located at the back of the engine in the top of the transmission bellhousing.
 
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Old 11-18-2007, 08:01 AM
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Default RE: ??Problems with my 1990 740

The one you said that is on top of the trans is the same as crank sensor right?? How can I test if the relay is bad???
 
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Old 11-18-2007, 08:05 AM
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Default RE: ??Problems with my 1990 740

Yes crank sensor.
If you have 2 of the relays just swap them for now and see if the car starts.
 
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Old 11-18-2007, 08:35 AM
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Default RE: ??Problems with my 1990 740

Tech it was the relay from the espandion tank i cleaned it with contact cleaner give it a few tabs and the car started righ away thanks for ur help!!!!
 
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Old 11-18-2007, 08:38 AM
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Default RE: ??Problems with my 1990 740

Glad you got it.
 
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