1999 Volvo S70 Hard Starts

Tiny
PMARINELLO489
  • MEMBER
  • 1999 VOLVO S70
Engine Mechanical problem
1999 Volvo S70 All Wheel Drive Automatic 125000 miles

Volvo S70 AWD B5254T, the car had a vacuum leak and used to stall. I repaired what was necessary, and changed both the front O2 Sensor and Air mass meter. The car also experienced hard starts and I thought this would have probably been the problem. Since then I have tested the fuel pump by bypassing the relay and it was within spec at keyon. I repeated. Next I tested it with the relay and it was not in spec by 25kpa at key on. Would a new relay fix this or do you think its something else because its pretty close to spec.
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Wednesday, September 23rd, 2009 AT 12:06 AM

8 Replies

Tiny
JIS001
  • EXPERT
Why did you replace the oxygen sensor and mass air meter to begin with? Also do you have any trouble codes stored in the engine control module?
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Wednesday, September 23rd, 2009 AT 9:56 PM
Tiny
PMARINELLO489
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P1142 Code was previously on the computer, as well as 02 sensor, figured i'd get the air mass meter to.
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Wednesday, September 23rd, 2009 AT 11:09 PM
Tiny
JIS001
  • EXPERT
Sorry but I could not find that code? Do you have any codes now? Also when you checked the fuel pressure, pressure should be between 375-395kpa with engine running. When you shut it off, residual pressure within 20 minutes after fuel pump shut off should be 200 kpa.
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Thursday, September 24th, 2009 AT 10:40 PM
Tiny
PMARINELLO489
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Thats all good.
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Friday, September 25th, 2009 AT 3:18 PM
Tiny
PMARINELLO489
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It was p1172 running lean.
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Friday, September 25th, 2009 AT 11:34 PM
Tiny
JIS001
  • EXPERT
If that is O.K. Then call Volvo and give them your VIN# and see if campaign 155 has being done? If not take it in to Volvo for it. That is free of charge to you. If it has being done already, find out if the extended warranty for the throttle has expired or not, If still under warranty you will need to take to Volvo to have them diagnsose the throttle to see if it is bad or not. If it is still under the 10 year/200k mile warranty they will replace the throttle if it is bad. If not you will need to pay for for diagnosing and repairing. If you are out of the extended warranty, try cleaning the throttle. I recommend buying the cleaner from Volvo since most carb cleaners will destroy the throttle since it is a control unit itself. Hope this information helps you.
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Saturday, September 26th, 2009 AT 11:44 PM
Tiny
PMARINELLO489
  • MEMBER
That has no been done to the car yet because last time I went to have the software installed, I had a check engine light and Volvo couldn't communicate with the car or something, since then I have got rid of the check engine light and I plan to visit the dealership tomorrow afternoon.
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Sunday, September 27th, 2009 AT 10:46 AM
Tiny
JIS001
  • EXPERT
Your problem almost seems familiar with a car I had problems once also? Hard to start at times and check engine light? Try this. When you start the car up try to wiggle the engine control module. The module is located on passenger side towards the fender. Remove the cover yu will see 2 modules. The once closest to the fender is the ECM. The other one is the transmission control module. You can not remove the module unless you have the special tool to remove it. Kinda twist around gently. If the car dies then your module is bad.
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Monday, September 28th, 2009 AT 12:27 PM

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