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Intermittent Power Loss in 1989 Chevy G10 Van with 305



 
 
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  #1  
Old September 7th 06, 10:31 PM posted to rec.autos.tech
unr
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Posts: 7
Default Intermittent Power Loss in 1989 Chevy G10 Van with 305

Intermittent Power Loss in 1989 Chevy G10 Van with 305

For 10K the van loses power intermittently for 1 to 10 seconds then comes
back to normal power. It happens at all speeds from thruway to idle. A
variety of shops including a Chevy dealer have failed to eliminate the
problem. The following have been checked or replaced: fuel pump pressure
checked, fuel filter replaced, spark plugs and wires replaced.

Does anyone have experience with this specific probem on this vehicle engine
or similar?

Any guidance would be appreciated.



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  #2  
Old September 8th 06, 03:56 AM posted to rec.autos.tech
187
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Posts: 44
Default Intermittent Power Loss in 1989 Chevy G10 Van with 305

sounds like a throttle posotion sensor.
does it idle good, or does it go up and down?
i saw u replaced plugs and wires, what about dist. cap and rotor button?
really sounds like TPS though.
hope this helps
matt

  #3  
Old September 8th 06, 11:39 AM posted to rec.autos.tech
unr
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Posts: 7
Default Intermittent Power Loss in 1989 Chevy G10 Van with 305

Thanks for your idea.
We also changed the distributor cap and rotor.
It idles fine when not experiencing the problem. Then when it happens it
dies at idle and needs to be started again. The idle doesn't go up and
down.

Do you still think we should try TPS or is that only a suggestion if the
idle goes up and down.

We really appreciate your suggestion because everyone who has looked at it
has failed to find the problem and that has never been mentioned.
Thanks.

"187" > wrote in message
lkaboutautos.com...
> sounds like a throttle posotion sensor.
> does it idle good, or does it go up and down?
> i saw u replaced plugs and wires, what about dist. cap and rotor button?
> really sounds like TPS though.
> hope this helps
> matt
>



  #4  
Old September 8th 06, 12:22 PM posted to rec.autos.tech
Ken[_3_]
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Posts: 27
Default Intermittent Power Loss in 1989 Chevy G10 Van with 305

Intermittent problems can be the toughest to figure out. Has the
problem been recreated by any of the shops you take it to? Often an
intermittent problem cannot be figured out because it cannot be
recreated by the technician.

unr wrote:
> Thanks for your idea.
> We also changed the distributor cap and rotor.
> It idles fine when not experiencing the problem. Then when it happens it
> dies at idle and needs to be started again. The idle doesn't go up and
> down.
>
> Do you still think we should try TPS or is that only a suggestion if the
> idle goes up and down.
>
> We really appreciate your suggestion because everyone who has looked at it
> has failed to find the problem and that has never been mentioned.
> Thanks.
>
> "187" > wrote in message
> lkaboutautos.com...
> > sounds like a throttle posotion sensor.
> > does it idle good, or does it go up and down?
> > i saw u replaced plugs and wires, what about dist. cap and rotor button?
> > really sounds like TPS though.
> > hope this helps
> > matt
> >


  #5  
Old September 8th 06, 01:10 PM posted to rec.autos.tech
unr
external usenet poster
 
Posts: 7
Default Intermittent Power Loss in 1989 Chevy G10 Van with 305 EXPERT NEEDED

No, the van often works fine for many days or many hours. Sometimes we go
weeks with no symptoms.
We haven't been lucky enough to have it happen in a shop.

And it isn't getting more frequent. This has been going on for over a year
and we still haven't hit a consistent period when we can get it into a shop.

Thanks

"Ken" > wrote in message
oups.com...
> Intermittent problems can be the toughest to figure out. Has the
> problem been recreated by any of the shops you take it to? Often an
> intermittent problem cannot be figured out because it cannot be
> recreated by the technician.
>
> unr wrote:
> > Thanks for your idea.
> > We also changed the distributor cap and rotor.
> > It idles fine when not experiencing the problem. Then when it happens

it
> > dies at idle and needs to be started again. The idle doesn't go up and
> > down.
> >
> > Do you still think we should try TPS or is that only a suggestion if the
> > idle goes up and down.
> >
> > We really appreciate your suggestion because everyone who has looked at

it
> > has failed to find the problem and that has never been mentioned.
> > Thanks.
> >
> > "187" > wrote in message
> > lkaboutautos.com...
> > > sounds like a throttle posotion sensor.
> > > does it idle good, or does it go up and down?
> > > i saw u replaced plugs and wires, what about dist. cap and rotor

button?
> > > really sounds like TPS though.
> > > hope this helps
> > > matt
> > >

>



  #6  
Old September 8th 06, 02:07 PM posted to rec.autos.tech
George[_1_]
external usenet poster
 
Posts: 42
Default Intermittent Power Loss in 1989 Chevy G10 Van with 305

I don't know what that engine has, so this may not apply. But, we had a
Buick of (IIRC) 1980's-vintage that acted like that. The problem was a
bad intake airflow sensor.

Other vague memories: EGR? vacuum leak?

G


On Thu, 7 Sep 2006 17:31:56 -0400, "unr" > wrote:

>Intermittent Power Loss in 1989 Chevy G10 Van with 305
>
>For 10K the van loses power intermittently for 1 to 10 seconds then comes
>back to normal power. It happens at all speeds from thruway to idle. A
>variety of shops including a Chevy dealer have failed to eliminate the
>problem. The following have been checked or replaced: fuel pump pressure
>checked, fuel filter replaced, spark plugs and wires replaced.
>
>Does anyone have experience with this specific probem on this vehicle engine
>or similar?
>
>Any guidance would be appreciated.
>
>


  #7  
Old September 8th 06, 06:35 PM posted to rec.autos.tech
unr
external usenet poster
 
Posts: 7
Default EXPERT NEEDED 4 Mystery: Intermittent Power Loss in 1989 Chevy G10 Van with 305

I just checked the records and both the throttle position sensor and the air
control valve *were* replaced. Neither of these fixed the problem.

The fuel pump has not been replaced but the pressure checked fine in the
Chevy dealership.

The coil has not been replaced.


"unr" > wrote in message
t...
> Intermittent Power Loss in 1989 Chevy G10 Van with 305
>
> For 10K the van loses power intermittently for 1 to 10 seconds then comes
> back to normal power. It happens at all speeds from thruway to idle. A
> variety of shops including a Chevy dealer have failed to eliminate the
> problem. The following have been checked or replaced: fuel pump pressure
> checked, fuel filter replaced, spark plugs and wires replaced.
>
> Does anyone have experience with this specific probem on this vehicle

engine
> or similar?
>
> Any guidance would be appreciated.
>
>
>



  #8  
Old September 8th 06, 07:11 PM posted to rec.autos.tech
George[_1_]
external usenet poster
 
Posts: 42
Default EXPERT NEEDED 4 Mystery: Intermittent Power Loss in 1989 Chevy G10 Van with 305

What does it do when it fails? Any backfire? Does it just abruptly
lose all power, or gradually slow down, or ...? When you give it more
gas, do you get any response? Do you hear anything?

And, for how relatively little it costs, I'd probably replace the coil.


On Fri, 8 Sep 2006 13:35:13 -0400, "unr" > wrote:

>I just checked the records and both the throttle position sensor and the air
>control valve *were* replaced. Neither of these fixed the problem.
>
>The fuel pump has not been replaced but the pressure checked fine in the
>Chevy dealership.
>
>The coil has not been replaced.
>
>
>"unr" > wrote in message
et...
>> Intermittent Power Loss in 1989 Chevy G10 Van with 305
>>
>> For 10K the van loses power intermittently for 1 to 10 seconds then comes
>> back to normal power. It happens at all speeds from thruway to idle. A
>> variety of shops including a Chevy dealer have failed to eliminate the
>> problem. The following have been checked or replaced: fuel pump pressure
>> checked, fuel filter replaced, spark plugs and wires replaced.
>>
>> Does anyone have experience with this specific probem on this vehicle

>engine
>> or similar?
>>
>> Any guidance would be appreciated.
>>
>>
>>

>


  #9  
Old September 8th 06, 07:22 PM posted to rec.autos.tech
jeffcoslacker[_109_]
external usenet poster
 
Posts: 1
Default Intermittent Power Loss in 1989 Chevy G10 Van with 305


Not getting pinging associated with it when it happens, are you?

The HEI distributors' centrifugal spark advance would sometimes hang
fully advanced intermittantly (rusty), usually after a hard
acceleration, then when you stepped down on it again, you'd get flat
reaction and hard pinging...

Not sure if '89 still had the mechanical advance either...

Is that carb'd or TBI?


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  #10  
Old September 9th 06, 02:36 AM posted to rec.autos.tech
unr
external usenet poster
 
Posts: 7
Default EXPERT NEEDED 4 Mystery: Intermittent Power Loss in 1989 Chevy G10 Van with 305

When if fails it just cuts out with no backfire, no sputter, no gradualness.
If you then give it gas there can sometimes be no power at all or, other
times, much reduced power, almost enough to maintain speed but no
possibility of accelerating. There is no unusual sound.

I have been carrying both the coil and the computer which I will now replace
but am trying to collect a list of all possible options to do them all at
once. This issue has been such an aggravation in its tendency to reappear I
really want to try to put it down once and for all.

Thanks for the guidance.


"George" > wrote in message
...
> What does it do when it fails? Any backfire? Does it just abruptly
> lose all power, or gradually slow down, or ...? When you give it more
> gas, do you get any response? Do you hear anything?
>
> And, for how relatively little it costs, I'd probably replace the coil.
>
>
> On Fri, 8 Sep 2006 13:35:13 -0400, "unr" > wrote:
>
> >I just checked the records and both the throttle position sensor and the

air
> >control valve *were* replaced. Neither of these fixed the problem.
> >
> >The fuel pump has not been replaced but the pressure checked fine in the
> >Chevy dealership.
> >
> >The coil has not been replaced.
> >
> >
> >"unr" > wrote in message
> et...
> >> Intermittent Power Loss in 1989 Chevy G10 Van with 305
> >>
> >> For 10K the van loses power intermittently for 1 to 10 seconds then

comes
> >> back to normal power. It happens at all speeds from thruway to idle.

A
> >> variety of shops including a Chevy dealer have failed to eliminate the
> >> problem. The following have been checked or replaced: fuel pump

pressure
> >> checked, fuel filter replaced, spark plugs and wires replaced.
> >>
> >> Does anyone have experience with this specific probem on this vehicle

> >engine
> >> or similar?
> >>
> >> Any guidance would be appreciated.
> >>
> >>
> >>

> >

>



 




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