No start
This is my '94 850. Car was running great yesterday with no problems.
I went to start my car this morning and it started up, but was running really rough and was making some noises. I shut it off and tried to start it again, but did not start. It almost sounds like no compression when turning over. I checked for spark and it has it. I tried to get a fuel pressure gauge on it, but the throttle cable bracket is in the way. It does seem to have pressure after each time of turning the key on, so I am assuming the pump is running. I tried cranking it over more, but the battery died and I can't seem to get it charged by jumping it. I checked out the timing marks and they still look lined up. The belt is in tact and still has good tension, so I don't think the timing belt jumped. I looked through the spark plug hole and could not see anything abnormal like damage, coolant, etc. I do not see any coolant in the oil and the coolant level is fine. I did a compression test and here are the results. #1-130 psi #2-180 psi #3-180 psi #4-170 psi #5-180 psi I know #1 cylinder is quite a bit off, but shouldn't the car still run? I am going to get the throttle cable bracket off so I can get a fuel pressure gauge on it. |
Have fuel pressure. Is at 40 psi when cranking over. Can feel injectors pulsing.
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Turbo or no turbo?
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If it did run, it would run very badly with that much of a compression difference in cyl #1.
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Originally Posted by Legendsecko87
(Post 189754)
Turbo or no turbo?
Originally Posted by fcpgroton
(Post 189756)
If it did run, it would run very badly with that much of a compression difference in cyl #1.
I noticed that the tach is doing nothing. I got some codes from A3 and they were 213,214, and 442. There was no stored codes in A2 or A6. A7 had 122 and 132. I guess the code in A7 would explain nothing on the tach, but would it cause a no start? |
I tested the rpm sensor and it is working fine. I am going to replace the battery because it does not seem to be taking a charge. I know some cars are very sensitive to battery voltage, so I hope this is the problem.
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130 PSI wouldn't cause an outright misfire. You should notice a bit of instability at idle, but that's it. I'd start with the RPM sensor code. The sensor itself is fine... that's no surprise, magnetic sensors rarely go bad- they're a magnet, a coil or wire. Nothing more. But wiring can go bad. So check the wiring between the ECM and sensor for continuity as a first step. Keep in mind- codes don't tell you what is wrong with the vehicle, they merely tell you where it "hurts." They can help you to make a diagnosis, they aren't, in themselves, a diagnosis. Good luck!
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Originally Posted by Carrots
(Post 189807)
130 PSI wouldn't cause an outright misfire. You should notice a bit of instability at idle, but that's it. I'd start with the RPM sensor code. The sensor itself is fine... that's no surprise, magnetic sensors rarely go bad- they're a magnet, a coil or wire. Nothing more. But wiring can go bad. So check the wiring between the ECM and sensor for continuity as a first step. Keep in mind- codes don't tell you what is wrong with the vehicle, they merely tell you where it "hurts." They can help you to make a diagnosis, they aren't, in themselves, a diagnosis. Good luck!
Will have updates tomorrow! |
New battery, still not running. The old one was bad though. I am looking through the service manual about testing all the sensors and it is saying I need a breakout box to do all of the tests. Do I really need that to test everything?
I tried to see if the injectors were pulsing while cranking the engine over with a test light and both wires have power even while cranking. They do not seem to be pulsing. This cars electrical system seems to be much different than any other cars I have worked on. I don't seem to know where to start with this! |
Just checked the coolant temp sensor. It is at around 7 ohms. The temp here is around 60-70 deg. The service manual says it should be at 2800 ohms for 68 deg. If the sensor was bad, I would think the temp gauge would be pegged with this low resistance, but it is not.
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Engine seized up, problem solved.
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