This problem occured one morning. I had a code reader with me and connected, no error codes. Put a little gasoline in TBI and engine ran as long as someone squirted a bit in the intake, but not any further. Towed vehicle home, couple of days later all was well? engine started, and continued running. Can't trust this. I researched and found out there was an oil pressure switch which took over after initial start supplying fuel pump voltage. Pressure at fuel rail is approx 58 lbs with key on. Then I started engine, pulled fuel pump relay and engine fuel pressure died off and engine as well. Problem is, I can't locate this oil pressure/sender anywhere. It's supposed to have a three wire connector. Another problem, I can't really trust schematics for this model year suburban. Some indicate an oil pressure/sender, others only have an oil pressure sender, only source for fuel pump is from relay in fuse panel. I'm a bit confused and could use some help at this point since I don't want to get stuck in a remote location again.
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Re: 7.4 liter mpfi engine starts, then shuts down.
The oil pressure sending unit should be located behind the distributor way in the back angled away from the engine, fuel filter been changed? www.aceautomotive1.com if you findd this information helpful please give me a good rating
if you like i can email you a diaggram and location of the sensor you need
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You don't have TBI on that car. You have a drive by wire car. You should have got APP or ETC codes. If the check engine light isn't on and you get no codes at all. Your probably looking at a PCM replacement. Wiring should be checked before replacing it.
Well that's not very specific. You should add the make, type, and engine of the vehicle. You can look up your specific codes online also, but since it's a 1986 the codes are pretty generic. You can go to your model forum, and look for the same problems, and youtube too.
Take it by an auto parts store like Auto Zone or O'Reilly Auto Parts and they can connect a reader to your car's computer and give you the codes. Write down the codes exactly as they say, and then find out what that code means for your model car on the internet.
Intermitten problem, as vehicle is running the computer is continuely recording, while the error is happening the code is registered. After the problem is not happening the computer records new information and does not maintain the old. Fix, find a road long enough to get the error code and safe enough to shut off vehicle exactly at the time of the engine light goes off. Place a jumper wire in the A/B ports of the onboard access connectors under side of dashboard under steering columns. This will be a electrical plug in with ten ports, top to left ports are the ones to run a jumper across. Turn on ignition switch do not start, the check engine light will flash. First it will flash once pause flash twice, this is the function code that lets you know the system is working. This will repeat 3 times, watch the code after that. Will work in same way first digit of code will flash and then pause second flash count is second digit of code.
Go to your local auto parts store and ask if they can hook up a code reader and give you the codes in the computer, if the codes are p0300,301,302,303 or 304 numbers this indicates a missfire on a particular cylinder 1,2,3, or 4 if your car seems to be fine now have them clear the codes and see if it returns.
Sounds like the knock sensor has failed. It's on the passenger side at the bottom of the engine block, in front of the starter. One wire going to it. Have you checked the timing lately, maybe it has moved?
Sometimes you can reset the engine warning light by disconnecting the battery for ten minutes or more (be sure you have your stereo unlock code if needed). That is not a good solution, it is better to diagnose and eventually fix the problem. Have the car computer scanned with a code reader, the codes you get in return witll tell you exactly where to find the problem.
Here is the code list.
To get the codes the code reader must be connected to the car computer.
sometimes on Bmw you may need a Interface 16 pin Adapter, depending on the code reader.