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98 V70 T5 Won't start V70-XC70 1998

98 V70 T5 150,000 miles. No prior problems. Got car washed, started to accelerate away from car wash, engine missed a bit, then smoothed out-thought maybe missing was related to car wash. Got on freeway, drove 30 miles to destination, engine ran ok, but bucked on acceleration. Turned off car. Twenty minutes later, I tried to restart engine and engine would start, run rough for just a second and die. Would just catch and die, never got past low rpm start. I’ve had ce light on for months, with po445 and po442 codes. I opened hood to see if anything obvious was wrong and discovered large hole in vacuum line below valve cover on driver side of engine (this has probably been like this for months). I used a piece of surgical tubing to replace vacuum line. The car started, I drove it 30 miles back home but on freeway, engine died, no response to gas pedal, then engine started running again before I coasted to side of road. This happened three times. Coming down freeway off ramp, engine died again. Coasted into parking lot, opened hood, checked to see if surgical tubing had melted, it was intact, got in car, tried to start again, and it fired, and I drove it home the remaining mile. Wife was following me in her car and said my car was emitting "bad smell" as it drove down the freeway. The next morning, I purchased new piece of vacuum line, replaced the surgical tubing that I had used to fix the leak. I tried to start, and engine started, ran very rough, lots of white/black smoke coming from exhaust. After less than a minute, the engine died. Engine will not start or even catch at all and have been trying for days. I can smell gasoline after I try to start the car. I disconnected the gas line at the fuel rail. Fuel is pumping when engine is cranked. Pulled one of the plugs and confirmed there is spark. Car does not fire at all now. Just turns over. Pulled codes po172, po455, po442 and po103. Cleared all codes. Engine just spins at cranking. Now I don’t think problem was related to the broken vacuum line, as hole in vaccuum line has probably been that way for months. Cost of tow to my mechanic is going to be $200 to $300. Looking for some input for what the problem might possibly be so maybe can get the engine started again and drive the car to mechanic instead of tow.
John K
1998 V70 T5








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98 V70 T5 Won't start V70-XC70 1998

Problem solved: Bad MAF and dirty and corroded engine connectors. Replaced MAF and cleaned sensors and car runs great.








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98 V70 T5 Won't start V70-XC70 1998

P0442 = Volvo Code EFI-612 Fuel Tank System Small Leak


P0445 = Volvo Code EFI-541 Canister Purge Valve Signal Low
results in poor performance, fuel odour, uneven idling

P0172 = Volvo Code EFI-231/EFI-232 Long term fuel trim at upper limit
results in high fuel consumption and poor performance.
this one seems related to the canister purge valve leakage.

Don't unplug the MAF while the key is in pos II or engine is running.
check for voltage of 0.1-0.2V between pins 2 & 4 at idle with MAF still plugged in.
Does the car idle better with the MAF unplugged?
Does cleaning MAF help? How about cleaning the connector contacts?
Can you borrow a MAF to try?

check grounding:
turn car off
wait 5 minutes
unplug MAF
check resistance between pin 1 and ground on MAF connector - should be 0 ohms
check resistance between pin 2 and ground on MAF connector - should be 0 ohms

check sensor signal:
ign to pos II
check voltage between pin 4 and ground - should be 0-1V


This fault also could be related to a bad fuel pulse damper (shiny disc thing attached to fuel rail) though I wouldn't think this would keep the car from starting.

P0121 = Volvo Code EFI-121 MAF signal too high
results in uneven idle and poor running


Also I would be replacing vac line like crazy - replace every vac line you can get your hands on.

This doesn't sound like a CPS but make sure the wire is routed away from the ign wires.
--
1998 V70 AWD Turbo 195k+








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98 V70 T5 Won't start V70-XC70 1998

When my 1998 V70 T5(Manual) exhibited similar symptoms, my indie spent several hours troubleshooting the usual suspects, but eventually concluded that the Engine Control Module (ECM) had failed. He spent several days trying to locate a replacement (Bosch #608; $450), rather than paying big $$$ to the local dealer.

However, your codes seem to lead in another direction (Evaporative Emission System).

Good luck, and let us know what you find.







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