No start after tune up

[shotime1994]

Hi I have a 94 mtx sho and I just did valve cover gaskets, sparkplugs, wires, bbbs port and polish runners and 77mm throttle body after I put it back together I started the car it was running for 15 mins real nice then stalled out and wont restart I lost spark I then replaced the dis and coil pack still no spark any input will be extreamlly helpful. Thank you

 

[Vnuk1]

Did you check and make sure everything that is supposed to be grounded on the Intake is tight that has been known to be a problem.

 

[Brett]

Did you check and make sure everything that is supposed to be grounded on the Intake is tight that has been known to be a problem.

I'd be willing to bet something isn't grounded.

 

[Vnuk1]

I'd be willing to bet something isn't grounded.

DIS? There are alot of threads about it and that is the culprit most of the time.

 

[shotime1994]

Hi what wouldnt have got grounded on the intake? and also the the intake is powdercoated white where the dis sits is also painted is that a ground for the dis or no Thank you

 

[Ishodu]

One of the screws for the DIS is a ground it shouldn't have been painted behind it. Also there is a ground strap that attaches on the rear of the intake and the path to the dis must be a good ground path.

 

[Vnuk1]

The four bolts that hold the DIS need to be tight or it might not ground. Just go through everything you see and tighten it to make sure.

 

[shotime1994]

Are you talking about the ground that goes on the intake bracket?

 

[shotime1994]

Also why would the car run for 15 min then stall maby a crank or cam sensor could have gone bad?

 

[Vnuk1]

CPS yes that is possible. Have you changed your Water Pump and or inspected the current one for leaks?

 

[USHOMEISHOU]

^^^^x2

 

[shotime1994]

Its not leaking but like I said the car was running smooth the just stalled like someone shut it off could the cps just break like that the car has 104k on it.

 

[Vnuk1]

With a SHO anything is possible, but without seeing it myself thats is likley to be the problem. Have you checked for codes?

 

[shotime1994]

What about the cam sensor will that cause the car to have no spark and will the ignition switch do the same?

 

[Vnuk1]

Well is it still not running? Have you tried starting it again and did you remove the cam sensor at all?

 

[shotime1994]

Its still not running and I didnt remove the cam sensor. I dont want to go out and spend a lot on a crank pos sensor and still have my car not start you know.

 

[Vnuk1]

In that case go through and tighten every bolt you see and try restarting. If that proves not be the cause then just replace the CPS you're going to have to replace it anyway. Again have you tried pulling any codes this will help you determine if you need to replace the CPS. CPS failure will not throw a code though but will help rule out any other problems if nothing pops up.

 

[shotime1994]

There are no codes and I torqued every bolt and rechecked again so its prob the crank sensor right.

 

[USHOMEISHOU]

Sounds alot like the crank sensor, when mine failed it would work until the engine warmed up and then stop sending a signal which would cause a no spark issue until the engine cooled down. Once the engine cooled it would start right up again until it got warmed up, then die again and so on. I replaced the CPS and it's been runnin fine for almost two years now


***edit: to answer your question, yes, it does sound like your Crank Sensor.

 

[shotime1994]

I will replace crank sensor tommorow and let everyone know what happens Thank you all for your help.