After engine R&R no start when hot

[87LtdT]

Started a new thread on the same topic...

Installed new engine...used a reportedly new crank sensor, a slightly used cam sensor (both looked new), a new Casper cam sensor cap, and the coil and module from my original engine...replacement coil and original 40k mile module.

After new engine install it started immediately on first try. Drove around a mile or two let idle for a while and shut it off...would not restart. Let it sit for about 30 minutes and it started again. Repeated the same a few days later. Checked for crank sensor gap...it was OK, checked to insure cam sensor would not rotate...it didn't, and confirmed the module was correctly attached to the coil (it had to be because I didn't disturb it when removed from original engine).

Obtained NOID light but engine started at each attempt...then went on a one month vacation. Got back last Thursday and today I looked at it again.

Today started engine and let it idle for 10-15 minutes...shut it off and installed NOID light. Attempted to restart and it did not start, and no NOID light i.e. no injector pulse. Checked for spark...no spark either.

The diagnosis is???

Thanks, Bob

 

[87LtdT]

Have now changed the ignition module and the crank sensor with no effect. Engine still starts fine when it has sat for a while, but after running for 10 or so minutes it will not restart.

Have remembered that during the engine swap I installed a used oil temp sensor instead of using the one off my original engine.

What happens if an oil temp sensor is bad?? Gonna post this general question as a unique post as well.

Bob

 

[turbobuick1]

It might be a good idea to check to see how hot your starter is getting. I have heard of (but have no personal experience with) failing starter solenoids getting heat soaked and not wanting to close the contacts until it cools down.

Might be worth looking into. Obviously, the starter getting hot on a turbo Buick is no big issue normally, but maybe a failing solenoid would exhibit this kind of behavior.

 

[87LtdT]

Thanks for the input...

When "hot" (and by hot I mean the engine is warmed up normally from idling or a short drive) and the engine doesn't start, it still cranks fine. There is just no spark at the plugs nor any signal to the injectors.

Given this, do you still think my no start is due to a too hot starter??

Where at in Central IN?? Columbus here.

Thanks, Bob

 

[turbobuick1]

Thanks for the input...

When "hot" (and by hot I mean the engine is warmed up normally from idling or a short drive) and the engine doesn't start, it still cranks fine. There is just no spark at the plugs nor any signal to the injectors.

Given this, do you still think my no start is due to a too hot starter??

Where at in Central IN?? Columbus here.

Thanks, Bob

Oh, I'm in Crawfordsville myself, about an hour and half from you. I apologize, I didn't read your entire post. No, my starter idea couldn't apply to your problem. It does sound like something electronic is getting heat soaked, or maybe it is related to your ECM's coolant temperature sensor. Maybe the ECM is seeing to way too high of a temperature and it is preventing the engine from being started? That might be a little far fetched, and I'm sure someone more knowledgable could chip in here. Did you try scouring the threads on turbobuick.com, looking for peoples solutions or fixes to no spark, no injector pulse problems? I have a factory manual, if I get a chance I will look over it.

 

[87LtdT]

Thanks...Turkey Run...our favorite State Park...we visit it 2-3 times a year.

Another fellow suggested coolant temp sensor could be the issue too. I never removed it from intake mfd. Maybe I'll just get a new one and eliminate it from consideration...at worst I've replaced a 22 year old sensor.

Thanks for your input.

Bob

 

[turbobuick1]

Thanks...Turkey Run...our favorite State Park...we visit it 2-3 times a year.

Another fellow suggested coolant temp sensor could be the issue too. I never removed it from intake mfd. Maybe I'll just get a new one and eliminate it from consideration...at worst I've replaced a 22 year old sensor.

Thanks for your input.

Bob

I moved here recently and have yet to go to Turkey Run, but I hear it's awesome. Do you have access to a scan tool? Something to view PID values (coolant,cam,crank, etc.) or a way to view any trouble codes that may have set? I know if you connect two pins on the ALDL port, your check engine light will flash any codes stored in the ECM.

 

[Just a Six??]

Open the coilpac to make sure its not all gooey inside. When cold it would be OK but hot & you never know? If its gooey its toast anyways.