'97 GC hesitation...
 

my '97 GC frequently has a brief hesitation after restarting a warm engine.
(I6.) When cold, I never notice a hesitation at all. I can drive until it
reaches operating temp. If I restart the engine before it completely cools
down, it will hesitate some on the first acceleration. It will occasionally
have a very mild backfire or 'pop' sound, then accelerate normally and run
fine the rest of the drive. This has never happened when cold. It starts
fine (within a couple turns of the engine..) Any ideas?

thanks,
cal

'97 GC hesitation...
 

Hi Cal,
Weak ignition wire or spark plug. It would show up instantly on an
oscilloscope. The unburned gas is ignited with the next firing cylinder.
God Bless America, Bill O|||||||O
http://www.billhughes.com/

Cal wrote:
>
> my '97 GC frequently has a brief hesitation after restarting a warm engine.
> (I6.) When cold, I never notice a hesitation at all. I can drive until it
> reaches operating temp. If I restart the engine before it completely cools
> down, it will hesitate some on the first acceleration. It will occasionally
> have a very mild backfire or 'pop' sound, then accelerate normally and run
> fine the rest of the drive. This has never happened when cold. It starts
> fine (within a couple turns of the engine..) Any ideas?
>
> thanks,
> cal

'97 GC hesitation...
 

L.W. ("ßill") Hughes III did pass the time by typing:
> Hi Cal,
> Weak ignition wire or spark plug. It would show up instantly on an
> oscilloscope. The unburned gas is ignited with the next firing cylinder.

Or coil. When my coil was going I got the same hesitation till it just
simply wouldn't start. (too bad they won't let folks just hit the coil
with a blast of freon to cool it off) :) That was an easy check.

> Cal wrote:
>>
>> my '97 GC frequently has a brief hesitation after restarting a warm engine.
>> (I6.) When cold, I never notice a hesitation at all. I can drive until it
>> reaches operating temp. If I restart the engine before it completely cools
>> down, it will hesitate some on the first acceleration. It will occasionally
>> have a very mild backfire or 'pop' sound, then accelerate normally and run
>> fine the rest of the drive. This has never happened when cold. It starts
>> fine (within a couple turns of the engine..) Any ideas?
>>
>> thanks,
>> cal

'97 GC hesitation...
 

A coil going bad for me acts like a rev limiter, I don't notice the
backfire, just lack of power.
God Bless America, Bill O|||||||O
http://www.billhughes.com/

DougW wrote:
>
> Or coil. When my coil was going I got the same hesitation till it just
> simply wouldn't start. (too bad they won't let folks just hit the coil
> with a blast of freon to cool it off) :) That was an easy check.

'97 GC hesitation...
 

I didn't mention that it only hesitates once after restarting. I can drive
hundreds of miles, stop and go, and it never does it again....until I shut
it off, walk away for a little while, and then restart before it completely
cools off. Does that make any difference concerning your ideas? thanks for
the help so far!

cal

"L.W. ("ßill") Hughes III" > wrote in message
...
> A coil going bad for me acts like a rev limiter, I don't notice the
> backfire, just lack of power.
> God Bless America, Bill O|||||||O
> http://www.billhughes.com/
>
> DougW wrote:
>>
>> Or coil. When my coil was going I got the same hesitation till it just
>> simply wouldn't start. (too bad they won't let folks just hit the coil
>> with a blast of freon to cool it off) :) That was an easy check.

'97 GC hesitation...
 

Hi Cal,
Yes, once the engine warms up, in your case dieseling takes over,
when that spark plug misfires.
God Bless America, Bill O|||||||O
http://www.billhughes.com/

Cal wrote:
>
> I didn't mention that it only hesitates once after restarting. I can drive
> hundreds of miles, stop and go, and it never does it again....until I shut
> it off, walk away for a little while, and then restart before it completely
> cools off. Does that make any difference concerning your ideas? thanks for
> the help so far!
>
> cal

'97 GC hesitation...
 

check for fault codes first

Cal wrote:

> my '97 GC frequently has a brief hesitation after restarting a warm engine.
> (I6.) When cold, I never notice a hesitation at all. I can drive until it
> reaches operating temp. If I restart the engine before it completely cools
> down, it will hesitate some on the first acceleration. It will occasionally
> have a very mild backfire or 'pop' sound, then accelerate normally and run
> fine the rest of the drive. This has never happened when cold. It starts
> fine (within a couple turns of the engine..) Any ideas?
>
> thanks,
> cal

'97 GC hesitation...
 

no fault codes. But I will try replacing the coil, checking wires and
plugs.
thanks for all the replies!

cal

"philthy" > wrote in message
...
> check for fault codes first
>
> Cal wrote:
>
>> my '97 GC frequently has a brief hesitation after restarting a warm
>> engine.
>> (I6.) When cold, I never notice a hesitation at all. I can drive until
>> it
>> reaches operating temp. If I restart the engine before it completely
>> cools
>> down, it will hesitate some on the first acceleration. It will
>> occasionally
>> have a very mild backfire or 'pop' sound, then accelerate normally and
>> run
>> fine the rest of the drive. This has never happened when cold. It
>> starts
>> fine (within a couple turns of the engine..) Any ideas?
>>
>> thanks,
>> cal
>

'97 GC hesitation...
 

with the vehicle running spray water on the plug wires and llok for arcing
best done in low lite

Cal wrote:

> my '97 GC frequently has a brief hesitation after restarting a warm engine.
> (I6.) When cold, I never notice a hesitation at all. I can drive until it
> reaches operating temp. If I restart the engine before it completely cools
> down, it will hesitate some on the first acceleration. It will occasionally
> have a very mild backfire or 'pop' sound, then accelerate normally and run
> fine the rest of the drive. This has never happened when cold. It starts
> fine (within a couple turns of the engine..) Any ideas?
>
> thanks,
> cal

'97 GC hesitation...
 

philthy did pass the time by typing:
> with the vehicle running spray water on the plug wires and llok for arcing
> best done in low lite

I built a "leak detector" out of a 110VAC Neon lamp from radioshack and a length
of insulated wire. Just run one leg of the lamp to the chassis ground and the
other down a dowell. If the lamp flickers you found a leak.

gnd>--------->lamp>------------>probe

Fairly simple and cheap.

> Cal wrote:
>
>> my '97 GC frequently has a brief hesitation after restarting a warm engine.
>> (I6.) When cold, I never notice a hesitation at all. I can drive until it
>> reaches operating temp. If I restart the engine before it completely cools
>> down, it will hesitate some on the first acceleration. It will occasionally
>> have a very mild backfire or 'pop' sound, then accelerate normally and run
>> fine the rest of the drive. This has never happened when cold. It starts
>> fine (within a couple turns of the engine..) Any ideas?
>>
>> thanks,
>> cal