long start when warm

[dramo1]

i also have the same problem that many people have with this..86 coupe 77000 ..cold starts right up..warm i get a long start and what seems to happen is the amp meter drops down to 9 or 10 and when i give it gas it starts sometimes reluctantly other times right away ..when it starts though the amps shoot back up to 13.5 to 13.9..i had the alternator checked and it is fine..

 

[MBDiagMan]

What do you mean by long start? Is the starter turning the engine slowly? Or is the starter turning the engine at the normal cranking speed but it just takes a long time for it to start?

Good luck,

 

[dramo1]

What do you mean by long start? Is the starter turning the engine slowly? Or is the starter turning the engine at the normal cranking speed but it just takes a long time for it to start?

Good luck,

yes starter sounds fine..it takes a long time to start and sounds like it needs more power to turn over..but only when warm

 

[tigmaned]

everyone says fuel injectors. but what i did for my 86 vette with 86K miles, ran fuel injector cleaner, double dosed it the last few tanks and starts all the time now. yeah my injectors maybe on the way out but it seems pretty good so far. worth a try.

 

[nyernga]

There is actually a TSB out on this condition from Chevrolet. My car has done the same thing for 5 years but since I only use it on weekends it's not an issue. The car is in the shop right now for a stalling issue and my mechanic informed me about the TSB. (technical service bulletin)

Len

 

[dramo1]

what do u do if there is a tsb about it..will chevy be able to fix it

 

[Robertwav1]

Try this....If you suspect the injectors, after the car is warm shut it down and restart immeadiately, within a few seconds. If it starts up normally you can bet the injectors are leaking when standing still. Now...let the car sit for a few hours after it's warm and see how it starts. Long start means it's flooded probably from injectors passing. The cleaning has to be done ultrasonically from what I'm told. Deposits just can't be removed any other way. Hope this helps.

 

[Jeroenvgfn]

I have the same "problem" with my 86

I will try the injector cleaner for a few tanks and post the results.

 

[tigmaned]

what worked for my 86 was 2 bottles of cleaner per half a tank of gas for about three tanks. start right up all the time, yeah they could still be leaking some but it starts right up.

 

[MBDiagMan]

First of all, I'm afraid that I am still not clear as to what is happening. Are you saying that the starter spins the engine at a slower than normal starting speed and that it must spin the engine for a long time before it starts?

Whatever the problem, DON'T just start throwing parts at the problem without doing some diagnosis first. That is almost always the most expensive way to fix it. If you do not have the experience or equipment to diagnose the problem, you will be money ahead taking it to a good tech for proper diagnosis.

If my understanding of your problem as I clarified it above is correct, the first thing to do is a Voltage Drop test on the starter circuit. Once the starter is spinning the engine at normal speed, if you still have a starting problem, you need to test the spark. It should make a nice, fat, blue spark.

If you have a fat, blue spark then check fuel pressure paying attention to the pressure when you first turn on the key. You should hear the fuel pump run for a few seconds then shut off. Make sure the pressure is up and stays up for several minutes after the key is turned off.

Good luck,

 

[tigmaned]

it seems like a 86 thing, but as our injectors get old and or dirty the leak, and they tell the computer its flooded and take a little longer to start then when engine is cold. like when cold engine starts right when you turn the key, when warm 5 to 10 second longer to start.

 

[thirdtimevetteowner]

My 89 is just the opposite. Cranks for a while when cold, but fires immediately when warm. I'm suspecting spark plugs, wires, or cap and rotor, or a combination of all 4. The wires are stock, probably all the other items too, since it only has 43k on the clock. Gonna do an ohms check on the wires today, and get some new plugs. Anyone reccomend the rapid fire Delcos? Or are they a waste of money, being so expensive? Or are my injectors leaking down? TIA.

Rich K

 

[Robertwav1]

what worked for my 86 was 2 bottles of cleaner per half a tank of gas for about three tanks. start right up all the time, yeah they could still be leaking some but it starts right up.

The problem with "still leaking", contamination of engine oil. This is my biggest worry, not the 3 or 4 second start. If your car starts right up all the time then I would think they aren't leaking.

 

[tigmaned]

yeah your right on that one, if gas is leaking and getting into the oil. not good!

 

[jiangtao]

thirdtimevetteowner, I have read somehwere that '89's all have that same kind of start you mentioned. I think it has something to do with the ECM. It's supposed to be that way. I drove an '89 and it was also like yours when starting. I also have an '86 with the same problem. Drives me nuts!! The only thing I haven't done is get the wiring fixed that goes into the fuel pump relay.{it has wire shrink}