Got the new temp sensor..still no start

[1986nate]

Originally Posted by Trevor

Was the car starting and running OK prior to installing a new temperature sensor? If not, what is the prior history? It is time to back track and apply logic.

Also, many times new temp sensors have been known to be bad right out of the box.

Where did you get the temp sensor from?

[JWillysvx]

The temp sensor code is gone, so I believe that problem is fixes. Befor the " no start" condition the check engine light would come on, the power would dramatically decrease; then the light would shut off and the power would return.


I bought the temp sensor from the dealer.

[Trevor]

Originally Posted by JWillysvx

The temp sensor code is gone, so I believe that problem is fixes. Befor the " no start" condition the check engine light would come on, the power would dramatically decrease; then the light would shut off and the power would return.


I bought the temp sensor from the dealer.

It is presumed that there was no starting problem before the sensor was replaced and only a temporary loss of power.

As no code is now registering, it is unlikely that the sensor is faulty.

Therefore it appears that something else was upset during work when the sensor was replaced. What could have been disturbed? Think on even the unlikely.

[SoCal LS-L]

The use of starting fluid sprayed into the throttle body thru the PCV or other intake ports would be a vital provider of information.

If it starts with starting fluid, you have confirmed properly timed spark, but no fuel, or no properly timed injection

If it does not, and you say you have confirmed that you DO have spark, then timing of fuel or spark is where you should look.

Since you checked the timing belt and cam alignment already, then it would seem to be a crank, cam, or MAF sensor problem if you cant kick it over with starting fluid.

[JWillysvx]

Would the MAF cause a no start? I will try starting fluid in the morning......if it is the MAF causing my troubles, should I purchase the Z32 (300z) MAF or stay stock?

What about the 90mm MAF from a 1995 Infinity Q45?

[MadMaxSvx]

A bad MAF can cause the not starting situation. The starting fluid test is a good idea, if it starts, then more likely you have a MAF problem.
In this case, is better to keep stock, unless you want to install an Ecutune or something.

[kwren]

Originally Posted by MadMaxSvx

A bad MAF can cause the not starting situation.

Maybe... But could a bad MAF prevent starting on a car that started "before" the temperature sensor was replaced.

Logic must be somewhere in the equation...

Keith

[SoCal LS-L]

Originally Posted by kwren

Maybe... But could a bad MAF prevent starting on a car that started "before" the temperature sensor was replaced.

Logic must be somewhere in the equation...

Keith

A new temp sensor was installed, dealer temp sensor.

Maybe he should resistance test it, or just leave it unplugged while cranking it over. A bad temp sensor right out of the box isnt unheard of.

Hopefully the starting fluid test will shed some light, with confirmed spark and confirmed fuel apparently, the only thing left is the timing of such, which will narrow the suspect list down a bit.

Im wondering if the regular unleaded gas thats in the tank is causing the knock sensors to retard the timing enough to cause a no-start..... that could be a factor as well.

[Trevor]

Originally Posted by Trevor

It is presumed that there was no starting problem before the sensor was replaced and only a temporary loss of power.

As no code is now registering, it is unlikely that the sensor is faulty.

Therefore it appears that something else was upset during work when the sensor was replaced. What could have been disturbed? Think on even the unlikely.

A bump towards applied logic.

[svxfiles]

Quote:
Originally Posted by Trevor
It is presumed that there was no starting problem before the sensor was replaced and only a temporary loss of power.

As no code is now registering, it is unlikely that the sensor is faulty.

Therefore it appears that something else was upset during work when the sensor was replaced. What could have been disturbed? Think on even the unlikely.

A bump towards applied logic.

Originally Posted by Trevor

A bump towards applied logic.

Is your TPS plug fully seated?

[subeman90]

Originally Posted by svxfiles

Is your TPS plug fully seated?

Hocrest who?

[svxfiles]

Originally Posted by subeman90

Hocrest who?

TEEHEEHEEHEE, snort!
Actually the wiring and TPS plug are in the "neighborhood" of the water temp sensor, so it is possible to bump it loose or, break a wire there.

[SoCal LS-L]

Correct me if im wrong, but doesnt the engine have to run for a bit before new codes could be set in the ECU? Or does the ignition just have to be on? Logic suggests that he check where he was working, as mentioned, but if he did get a bad temp sensor, could it still kick a code even on a no-start?

[JWillysvx]

Shot starting fluid directly into the plenum with the MAF unplugged.....nothing, not even a sputter Checked all the plugs, they are good. The no start problem has been a monkey on my back for months now, there has to be something simple I am over looking here

Originally--I parked it , shut it of then went to start...no start, tried to start on one or 2 cylinders but not enough to run.

Have spark, fuel...tomorrow I am going to pull a spark plug to check compression and spark timing.

TPS...throttle positioning sensor?

[kwren]

I would put the old temperature sensor back on and see if it still does the same as it did before replacing it... start but not run well...

might help you decide about the condition of the replacement sensor.

Keith