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Turbo Wagon bogs down/hesitates randomly when warm

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Holiday
Posts: 22
Joined: 7 April 2021
Year and Model: 1996 850 Turbo Wagon
Location: BC

Re: Turbo Wagon bogs down/hesitates randomly when warm

Post by Holiday »

On a test drive with the mechanic the impression was the turbo was workign well and not an immediate concern. Well I guess I'll just have to see how it goes on my journey. Just going to baby it and hope the issue doesn't get worse till I get to where I'm going.

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Sveedy
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Joined: 11 November 2019
Year and Model: 96 850 Turbo
Location: N. Arizona
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Post by Sveedy »

Well look at it this way;
The system is basically sealed from the airbox on till the throttle body. So your air comes into the airbox, past your MAF where the computer gets its info, travels down to the PTC valve, goes into the turbo, out of the turbo and into the intercooler before then into the throttle body. If you have a leak, even a small one in that path, then the computer isn't getting the right info, since the leak is after the MAF. Logic would dictate that the first problem you found, the turbo leak, needs to be addressed first if for no other reason than to get the system tight again, and to remove it through process of elimination as the cause of your problem.
Try to learn life's bad lessons vicariously through others.


1996 850 Turbo GLH ( Goes Like Hell )
1999 V70 GLT

Holiday
Posts: 22
Joined: 7 April 2021
Year and Model: 1996 850 Turbo Wagon
Location: BC

Post by Holiday »

Sveedy wrote: 27 Sep 2021, 08:15 Well look at it this way;
The system is basically sealed from the airbox on till the throttle body. So your air comes into the airbox, past your MAF where the computer gets its info, travels down to the PTC valve, goes into the turbo, out of the turbo and into the intercooler before then into the throttle body. If you have a leak, even a small one in that path, then the computer isn't getting the right info, since the leak is after the MAF. Logic would dictate that the first problem you found, the turbo leak, needs to be addressed first if for no other reason than to get the system tight again, and to remove it through process of elimination as the cause of your problem.
Yp, I think you are on the money there. Did a 9 hour trip on the highway today including hills. It was very obvious the turbo was failing 80 kph and above. Car struggled to go up hills. I think the turbo gets so hot and the air leak just gets more pronounced. Literally hear a whine or whistle noise from the engine bay after driving it for awhile. I'm keeping her in Ecoo Mode and trying to stay out of the turbo boost area. I got 4 more days of travel ahead.

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