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. |
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 |
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 > |
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 > > |
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 > > > > |
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. > > |
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. > > > |
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. >> >> >> > |
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? -- jeffcoslacker ------------------------------------------------------------------------ jeffcoslacker's Profile: http://www.automotiveforums.com/vbul...?userid=219638 View this thread: http://www.automotiveforums.com/vbul...d.php?t=616652 http://www.automotiveforums.com |
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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