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Hi All,
My Daughter was on the Seattle freeway(LOL)yesterday afternoon traveling between 10-20 MPH, the A/C was on and the outside temp was 104 F. The car is a 1989 760 Turbo, automatic, with 114,000 miles on the clock.
The engine stumbled and died. Upon trying to restart the engine would catch, run a second or two, stumble and die. Tried to start several times with the same results. Engine temp was in the middle and there were no warning lights on before it died. A nice State Trooper pushed her to a parking lot where she phoned me for a rescue.
I arrived two hours later (after loading tools and hitching the flatbed up) and it started and ran normal. Loaded it anyway and headed home. Started and ran fine this morning.
I think I'm looking at a hot soak issue and could not find this exact symptom in the FAQ. I have a Crank Position Sensor on order that should arrive in a couple of days.
Anything else I should look for or replace?
Thanks to all,
Mike
Laharview Farm
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1984-244 GL, 1985-244 DL, 1989-244 DL, 1989-760 Turbo, 1967 Mustang (271 HP 289) and 62 F-250 4x4 (262 - 6 cylinder)
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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UPDATE
Thanks to all for the helpful posts.
After investagation I found the hot soak stall problem was caused by bad solder connections in both the Radio Supression Relay and the Fuel Pump Relay.
I replaced both releys and resoldered the originals. The originals now reside in the glove box as spares.
Best Regards,
Mike
Laharview Farm
--
1984-244 GL, 1985-244 DL, 1989-244 DL, 1989-760 Turbo, 1967 Mustang (271 HP 289) and 62 F-250 4x4 (262 - 6 cylinder)
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Late post here. FWIW at this point: My car 1990 745T 205k miles, has had, last 120k miles, two such drivability problems pretty much as you describe here. Was RSRelay both times. My experience is that fcp groton has brand new fresh relays for a low price.
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Thanks Jon!
That looks like the relays near the left strut tower behind the P.S. reservoir.
Will resolder them tonight.
Best Regards to all,
Mike
Laharview Farm
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1984-244 GL, 1985-244 DL, 1989-244 DL, 1989-760 Turbo, 1967 Mustang (271 HP 289) and 62 F-250 4x4 (262 - 6 cylinder)
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Hi All,
Does anyone have a photo of the RSR relay location on the 1989 760 Turbo?
I do not see any relays near the coolent tank (right inner fender). There is one located in front and below the air box. Also, there are two relays on the left strut tower.
Thanks!
Mike
Laharview Farm
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1984-244 GL, 1985-244 DL, 1989-244 DL, 1989-760 Turbo, 1967 Mustang (271 HP 289) and 62 F-250 4x4 (262 - 6 cylinder)
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Hey Mike,
Don't have any photos of the relay on a turbo car... But the FAQ points to the left side strut tower or inner fender. Seems they moved the RSR around a bit over the years.
http://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#Radio_Suppression_Relay
Cheers, Jon
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Thanks Uncle Olaf,
Should I plan on replacing the impulse sensor also?
Best Regards,
Mike
Laharview Farm
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1984-244 GL, 1985-244 DL, 1989-244 DL, 1989-760 Turbo, 1967 Mustang (271 HP 289) and 62 F-250 4x4 (262 - 6 cylinder)
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Hey Mike,
It may not be a bad idea to replace the impulse sensor, but I would see if the RSR does the trick first, like aleekat suggested. You may want to pick up a seal kit for the distributor if you plan to do the impulse sensor. They often leak oil. Its a unfun job, but very doable. This part of the FAQ shows how to test the sensor and how to replace it and also talks about the seals in the distributor.
http://www.brickboard.com/FAQ/700-900/ElectricalIgnition.htm#Testing_Hall_Sensor
Cheers, Jon
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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The RSR supplies power to the injectors. The hall sensor(distributor) gives spark to the plugs. I would suspect RSR first.
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Post Back. That's whats makes this forum work.
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Update;
The solder connections were cracked on the Fuel Pump Relay. I installed the new one and will re-solder the original and carry as a spare.
I had modified the air box and removed the pre-heat hose at 100,000 mi when I bought the car.
Applied thermal compound to the power stage. Connection good on the 25 Amp fuse.
The car ran fine today however the outside temp is now 70 F.
I cannot locate a Crank Position Sensor on the back of the block. It seems the 760 (Turbo 2.3L) started using this in 1990. Hope IPD takes returns!
QUESTION:
Where is the Radio Suppression Relay located? Want to check it and re-solder it tomorrow.
Thanks to all!
Mike
Laharview Farm
--
1984-244 GL, 1985-244 DL, 1989-244 DL, 1989-760 Turbo, 1967 Mustang (271 HP 289) and 62 F-250 4x4 (262 - 6 cylinder)
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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89 740 B230F the RSR is tacked near the coolant reservoir and strut.
89 740 B230FT its on the drivers side near the power steering reservoir.
I'd replace any bad relays with new. There are most likely resistive
contact points causing the solder joints to crap out from overheating.
Bill
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Hey Mike,
The radio suppression relay is normally mounted near the coolant reservoir. Usually two relays clipped side by side, one is for the aux cooling fan and the other is the RSR relay. They are identical. If you pull one and the car starts, its the other relay. I forgot that the impulse sensor is in the distributor on the pre -'90 turbo models.
Best regards, Jon 'Uncle Olaf'
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posted by
someone claiming to be
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Wed Dec 31 18:00 CST 1969 [ RELATED]
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Thanks to all for the information and rapid response to my post.
I am leaving in the morning to volunteer at the local County Fair and will return home on 8-10-09. Upon returning I will check and repair these items and post back with the results.
Best Regards,
Mike
Laharview Farm
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1984-244 GL, 1985-244 DL, 1989-244 DL, 1989-760 Turbo, 1967 Mustang (271 HP 289) and 62 F-250 4x4 (262 - 6 cylinder)
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Hey Mike,
Sorry to hear about the trouble. I would consider replacing the Ignition Amplifier.
http://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm#HotStartProblemPowerStageOverheats
http://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm#EngineCutsOutatSpeedIgnitionPowerStageFailure
Others have given good suggestions, but I noticed no one brought this up. A faulty power stage can cut out while driving. Its especially prevalent on the turbo cars in hot conditions. Another thing to look at if you haven't already replaced it. Also, if you do choose to replace it, spend the extra money if you can and get a genuine Bosch part. FCP Groton has them for 80 bucks or so. Make sure you use the thermal compound on the back, and make sure the screws are firmly tightened. If you find the existing one has no compound, you can try redoing the compound on the back with thermal grease. You can get it at a Radio Shack or computer store. Clean the surfaces on the back of the ignition amp and the panel it mates to very well. Spread a even coat of the compound on the back of the module, and make sure the the screws are both there and firmly tightened. You should see a little spooge out around the edges.
Regards, Jon "Uncle Olaf'
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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You should check (and resolder as maintenance) the Radio Suppression Relay (fuel injection relay) too.
Underhood temps can get pretty toasty, and that might have been the cause.
Even if it wasn't the cause, it's a good thing to shore up with solder anyway.
Good Luck,
Will
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1990 740 Turbo, on its way to stock specs, maybe beyond
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Maybe the AMM got cranky.. How is the Air Box thermostat.
My other thought was the Fuel pump relay too.
Does the '89 700's have the 25 amp Fuse under the hood?
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'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm
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posted by
someone claiming to be
on
Wed Dec 31 18:00 CST 1969 [ RELATED]
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Fuel pump relay overheating. Pretty common.
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Post Back. That's whats makes this forum work.
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