Yesterday, I tried starting my '95 mtx sho and it wouldn't start. 2nd 3rd and 4th (10 secs between each try) tries failed also. I waited one minute and it started on the 5th try, but it reved at 1500 RPM and slowly idled and at the same time smoke blew out of the tail pipes. After that, the car ran fine, but I only drove it for a few miles. Now, is it the O2 sensors, the CPS, or the plug wires?
stalling ?'s
- Thread starter shoman95
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SHO--ripper
928 Euro
Plug wires wouldn't do that to a car. Neither would a CPS.A bad CPS would cause the car to die while you were driving it then it would start after a little while. As far as the O2 sensors I'm not sure. My SHO did that before i replace the fuel pump but when i tried to turn it over it wouldn't then i would lose all power. It eventually started. I'm not sure if it was because of a bad connection with the battery or if it was the pump. I haven't had the problem since I replaced the fuel pump. The black smoke does make it sound as if it has something to do with bad 02's but i'm not sure if that would cause the car not to start.All i can recommend is don't start ordering new parts until you have the problem properly diagnosed. Good luck.
SHO--ripper
928 Euro
When you said slowly idled do you mean lower than normal? if that's the case it might be the fuel pump. Let the car idle for a few minutes and if the revs are spurratic or if it stalls out you might very well have a bad fuel pump. Also, check the schrader valve to see if you have any fuel pressure. How many miles does you car have?
my car has 88k miles. what i meant by idling slowly was that when it turned over, it reved at 1500 RPM and slows dropped in RPMs to idle, which is normal at 850RPM. It didn't go below that.
I just recently replaced the fuel filter and the car has been runnung great until recently.I'm doing the rest of the 60k on monday (except for valve lash) which I'm gonna do next week)
I just recently replaced the fuel filter and the car has been runnung great until recently.I'm doing the rest of the 60k on monday (except for valve lash) which I'm gonna do next week)
projectSHO89
SHOless In St L
BTW, what color was that smoke? Black, blue, or white?
It isn't the O2 sensors.
Bad plug wires can cause hard starting, especially if the humidity is very high such as on a rainy day.
A bad CPS can cause stalling, bucking, no-start conditions at any time if they are intermittent.
If the smoke was black, my bet would be one or more leaking fuel injectors causing a flooding condition in one or more cylinders.
Otherwise, your hard starting problem sounds like a cam sensor.
Steve
It isn't the O2 sensors.
Bad plug wires can cause hard starting, especially if the humidity is very high such as on a rainy day.
A bad CPS can cause stalling, bucking, no-start conditions at any time if they are intermittent.
If the smoke was black, my bet would be one or more leaking fuel injectors causing a flooding condition in one or more cylinders.
Otherwise, your hard starting problem sounds like a cam sensor.
Steve
sdpatt
Sr. SHO Engr.
If the CPS is not working properly, your engine will not start and it will not run. Period. There is absolutely NO spark when the CPS has failed. The plug wires not being in good shape would cause a misfire, but would have no mechansim to prevent the engine from starting unless they weren't installed.
The white smoke is probably from a separate problem that is not related to the starting problem unless your cylinders are filling with coolant while the engine sits and preventing the engine from starting until it clears from the cylinders. Have you been losing coolant lately?
If you want to use the Forum, please let the experience of the large owner body help, rather than give us your own preconceived solutions then tell us to guess which is the right one. In this case, it is very unlikely that your choices are even part of the problem.
Your MTX should idle faster than 850 rpm. You should run the idle reset procedure first, then go from there. If the idle is not controlled properly, the IAC valve is one of the primary possibilites.
A valid solution to this condition would need a bit more information to have a chance at a real fix. Would you like some help?
The white smoke is probably from a separate problem that is not related to the starting problem unless your cylinders are filling with coolant while the engine sits and preventing the engine from starting until it clears from the cylinders. Have you been losing coolant lately?
If you want to use the Forum, please let the experience of the large owner body help, rather than give us your own preconceived solutions then tell us to guess which is the right one. In this case, it is very unlikely that your choices are even part of the problem.
Your MTX should idle faster than 850 rpm. You should run the idle reset procedure first, then go from there. If the idle is not controlled properly, the IAC valve is one of the primary possibilites.
A valid solution to this condition would need a bit more information to have a chance at a real fix. Would you like some help?
sdpatt- you're tight about that. I'm a new Sho owner and I don't know much about this car So, this problem could be a sensor? should I run codes. I just bought a code tester. I'm gonna run it and see what it comes up with.
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