1989 740 Turbo Trouble? Help?
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From: West Coast
1989 740 Turbo Trouble? Help?
We have a previously owned 740 sedan turbo, 1989, made in Halifax, NS, Canada Noticed trouble on the freeway today, turbo cutting out when over 4000 RPM. Any repair tips or suggestions? Thanks muchly 
no mo volvo
Joined: Oct 2010
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From: 37 North on the left coast
can you clarify what exactly you mean by 'turbo cutting out' ?
was the turbo boost gauge stuttering back to zero under high boost? or were you just missing power under heavy throttle? I've had both these symptoms at different times, completely different causes. or was it something else entirely?
was the turbo boost gauge stuttering back to zero under high boost? or were you just missing power under heavy throttle? I've had both these symptoms at different times, completely different causes. or was it something else entirely?
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Junior Member
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From: West Coast
1989 740 Turbo Trouble...
[QUOTE=pierce;368015]can you clarify what exactly you mean by 'turbo cutting out' ?
"was the turbo boost gauge stuttering back to zero under high boost? or were you just missing power under heavy throttle?"
The turbo boost gauge would stutter back to zero under high boost *and* there would be no power, but the power was there until it reached high boost (4000 RPM)
We don't have any maintenance records for it, of course, but it's got 363,000 kms on it. It's still a great car, we just want to get it running right for as little expense as possible
Thanks so much for your help and feedback.
"was the turbo boost gauge stuttering back to zero under high boost? or were you just missing power under heavy throttle?"
The turbo boost gauge would stutter back to zero under high boost *and* there would be no power, but the power was there until it reached high boost (4000 RPM)
We don't have any maintenance records for it, of course, but it's got 363,000 kms on it. It's still a great car, we just want to get it running right for as little expense as possible
Thanks so much for your help and feedback.
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
well, check all the air plumbing between the mass airflow meter (MAF, sometimes called air mass meter, AMM) and the throttle body, including the intercooler. when my 92 did something similar, as I said, it was the silicone rubber hose that went into the air intake side of the turbo, the bottom side of it was all soft with oil, and was getting sucked past the clamp under high airflow.
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From: West Coast
[QUOTE=pierce;368072]well, check all the air plumbing between the mass airflow meter (MAF, sometimes called air mass meter, AMM) and the throttle body, including the intercooler.
That did the trick! Sorry I don't know technical terms, but my husband found a ripped smaller hose and cracks around the bend of a bigger one, replacing one with an inexpensive new hose from Lordco, and repairing the other (more expensive looking one) with gasket maker. It's a temporary fix anyway until we can source out the proper Volvo parts.
Thank you so much for your prompt and awesome help!
That did the trick! Sorry I don't know technical terms, but my husband found a ripped smaller hose and cracks around the bend of a bigger one, replacing one with an inexpensive new hose from Lordco, and repairing the other (more expensive looking one) with gasket maker. It's a temporary fix anyway until we can source out the proper Volvo parts.
Thank you so much for your prompt and awesome help!
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