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Have just had similar problem with my 94, 850 estate. Stopped at lights all dash lights on, would not start. Got RAC man says no pulse to injectors no spark, so trucked home. ( bill to come!!) Guess what, get up knacked next morning and it starts. Take it to local Bosch man fault code says maf sensor fault and cam position fault. Recommends changing both sensors but he aint got them so will have to wait. £35 for diagnostics.
Look on web see cam position sensor c£100!! Dont want to spend money on things that get me no further forward like animal has done. Bring it home to wait for quote from Bosch man, run around town few miles for shoping, park up, go back and it wont start again. Wait till morning and see if things change again!!
Somebody must know what gives, PLEASE help with advice or what to do next!!
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I hope you find the forum to be helpful & enjoyable. If you could wait a bit, the top-dog of the forum named Moderator Tech would be back in a couple of weeks or less I believe.
If your 850 is '94, I believe it has both OBD-I & OBD-II diagnostic terminals (not sure if this applies to the UK models). If you need an instruction as to how to reset the codes, let me know and I'll post a pic that has all you need to know. You won't need any tools, just an average intelligence and code table are the only requirements.
In the United States, some auto parts shops provide free OBD-II diagnostic service, which gives you an instant access to the ECU (on-board computer) and let you know what the problems are.
With age, it is not unusual for both sensors to be shot. However, I would first reset codes and see if both codes come back. I am dead-exhausted right now due to working in Japan (gotta love the politics here[8D]), but if you need instructions as to how to test those sensors, I can either post instructions or guide you to a UK web site where I got the part of factory manuals from.
Also, Volvos, as well as all makes, require TLC and if regular tune-up & scheduled maintenance are neglected, the results would be quite costly.
Thanks JPN,
Have worked out how to reset codes from my haynes and get codes when I need em.
Bosch man reset codes when he did diagnostics but after Idid bit running about and parked up fault light was on and I got the same codes, ie MAF sensor and Cam pos sensor. I cleared the codes but would not start. Left it till morning and it started. Just moved it a few yards and no faults but scared to take it out in case packs in on highway.
Have deciced to bite the bullet and replace both sensors, expensive but got to get moving. Will take couple days, will let you know what happens.
Regards, Kris.
Hi Redturbo,
I believe engine management system for 850 volvo was designed and manufactured by the German firm Bosch. Many of the parts used, sensors etc, are made by Bosch. In the U.K. we have a chain of garage services run by the same firm hence Bosch man. I took my volvo there in the hope that they may be a bit more knowledgeable.-----What is "I like thatlol"?
Regards, Kris.
You're right, may European cars are equipped with Bosch parts, especially electrical & electronics components, including the fuel control/engine management systems. Even though European products are usually of top-quality, when it comes to electrical & electronics, Japanese & Koreans seem to get it better (Denso, etc...).
Anyway, I believe the problem has been resolved. I wish you luck, but come back anytime when you have a problem.
Hi Redturbo,
I believe engine management system for 850 volvo was designed and manufactured by the German firm Bosch. Many of the parts used, sensors etc, are made by Bosch. In the U.K. we have a chain of garage services run by the same firm hence Bosch man. I took my volvo there in the hope that they may be a bit more knowledgeable.-----What is "I like thatlol"?
Regards, Kris.
Interesting. Catching up on my English culture lol.
I like that term of Boschman. A lot mroe interesting to say than the regular mechanic.
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RE: 1994 volvo 850 won't start
