480 turbo jolting during turbo pressure

Cypher007 · May 28th, 2004, 09:58

im thinking of buying a 91 480 turbo with 97k on the clock, but during a test drive on hard acceleration the car started jolting while the turbo was at max psi. the rest of the time the car performed ok no lumpiness. there was no smoke from the tail pipe, but there did seem to be an oil leak at the back of the engine somewhere. any ideas on whats wrong and how expensive it could be to fix?

Peter Milnes · May 30th, 2004, 02:02

Do you have a boost gauge? if so did you notice what it was indicating during the "surging"( possibly overfuelling caused by poor electrical connecton around engine sensors and ECU).

All the best, Peter

Cypher007 · May 30th, 2004, 10:09

the pressure was steady but the jolting seemed almost like misfiring maybe caused by a dicky ht lead, but at normal non boost condition it was ok? there was an oil leak at the back of the engine somewhere, and also some sort of sticky goo coming out of the joint between the top inlet manifold and the bit that curls round into the engine, maybe fuel or instant gasket?

May 30th, 2004, 18:31

the problem on the car in question was caused by a faulty
airflow meter, this has been changed and the car now accelerates cleanly throughout the range. the oil leak has been cured by tightening the sump bolts.

May 28th, 2004, 09:58	#1
Cypher007 Master Member Last Online: May 17th, 2024 09:12 Join Date: Dec 2001 Location: Lincolnshire	480 turbo jolting during turbo pressure im thinking of buying a 91 480 turbo with 97k on the clock, but during a test drive on hard acceleration the car started jolting while the turbo was at max psi. the rest of the time the car performed ok no lumpiness. there was no smoke from the tail pipe, but there did seem to be an oil leak at the back of the engine somewhere. any ideas on whats wrong and how expensive it could be to fix? __________________ Volvo 854 T5R Yellow 1994 Aquamist 2D (Don & Aquamist) BMC panel filter (Don) Ferrita Cat Back (Don) Denso Iridium Spark Plugs (Hong Kong) PowerFlex Top Engine Mount (?) PowerFlex Wishbone Bushes (Elk Parts) 302mm front brake upgrade Goodridge front hoses (rears to be fitted later) 600W Inverter (ebay) History: 1991 Volvo 340DL (1982) 1994 Volvo 360GLE (1989) 1999 Volvo 360GLT (1988) 2002 Volvo 850GLT (1991) 2004 Volvo 850T5R (1994)

May 30th, 2004, 02:02	#2
Peter Milnes Premier Member Last Online: Apr 10th, 2014 00:01 Join Date: Feb 2002 Location: Tonyrefail	RE: 480 turbo jolting during turbo pressure Do you have a boost gauge? if so did you notice what it was indicating during the "surging"( possibly overfuelling caused by poor electrical connecton around engine sensors and ECU). All the best, Peter

May 30th, 2004, 10:09	#3
Cypher007 Master Member Last Online: May 17th, 2024 09:12 Join Date: Dec 2001 Location: Lincolnshire	RE: 480 turbo jolting during turbo pressure the pressure was steady but the jolting seemed almost like misfiring maybe caused by a dicky ht lead, but at normal non boost condition it was ok? there was an oil leak at the back of the engine somewhere, and also some sort of sticky goo coming out of the joint between the top inlet manifold and the bit that curls round into the engine, maybe fuel or instant gasket? __________________ Volvo 854 T5R Yellow 1994 Aquamist 2D (Don & Aquamist) BMC panel filter (Don) Ferrita Cat Back (Don) Denso Iridium Spark Plugs (Hong Kong) PowerFlex Top Engine Mount (?) PowerFlex Wishbone Bushes (Elk Parts) 302mm front brake upgrade Goodridge front hoses (rears to be fitted later) 600W Inverter (ebay) History: 1991 Volvo 340DL (1982) 1994 Volvo 360GLE (1989) 1999 Volvo 360GLT (1988) 2002 Volvo 850GLT (1991) 2004 Volvo 850T5R (1994)

May 30th, 2004, 18:31	#4
alexfairbridge Guest Location:	RE: 480 turbo jolting during turbo pressure the problem on the car in question was caused by a faulty airflow meter, this has been changed and the car now accelerates cleanly throughout the range. the oil leak has been cured by tightening the sump bolts.

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