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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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940 B230FK occasionally losing power / stallingViews : 795 Replies : 11Users Viewing This Thread : |
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Apr 20th, 2024, 16:19 | #1 |
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940 B230FK occasionally losing power / stalling
Hi there,
Can anyone help diagnose a problem I'm having with my 1998 Celebration 940 estate petrol automatic? It drives fine but then I'll suddenly lose power and the gas pedal will have no effect. Sometimes it recovers, other times it completely stalls with the various (normal) warning lights coming up on the dashboard indicating the engine has stopped. When it does that, after rolling to a standstill it takes 10-15 minutes before it starts again. The ignition and battery are all fine (new battery from the RAC the last time it broke down due to this on the M1!). I am thinking it's either the fuel pump -- which has never been replaced and the car has done 120,000 miles -- or possibly a dirty/broken MAF sensor. Either part is GBP 200 to buy new, so I wondered if anyone has any thoughts what the problem could be before I go ahead? Many thanks, Jonsoft Last edited by jonsoft; Apr 20th, 2024 at 16:58. |
Apr 20th, 2024, 16:41 | #2 |
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Does it run roughly,at all?
used parts available from a Celebration to assist with fault finding/diagnosing before spending big bucks on brand new.... |
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Apr 20th, 2024, 16:48 | #3 |
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It seems to run really smoothly when it works. Ignition starts first time, it idles well and never idles out, and responds well to the acceleration. Or about as well as a vehicle of this size and weight and age normally would without any "tuning"! It makes me think it is fuel-pump related rather than MAF.
The last time we broke down, when it eventually started again, we left it idling. Every now and then, once every 5 or 10 minutes, you heard the revs dip momentarily, but it didn't cut out. After that we were able to drive it home OK. 940volvoman are you offering parts or suggesting I find them? I definitely think you're right, it's a good idea like you say to try out a cheap used part first while I find what the problem is. |
Apr 20th, 2024, 17:06 | #4 |
Go redblock or go home
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It could be many things, it could be the fuel pump relay is getting hot breaking the contact, probably a dry solder joint that gets hot and then loses continuity until it's cooled down enough to resume normal service. You can test this one when it dies by quickly cranking the car by literally just flicking the key to start and instantly turning it off. Then turn the ignition back on and if the pump primes it's probably the relay, also put your hand on it (big white relay behind the ash tray) and see if it is hot.
My mate had a similar issue to yours that turned out to be the MAF but that was because it had an eBay special MAF on it, a used Bosch one cured it. It could also be the crank sensor breaking down due to heat and then once cooled down it starts working again. An easy way to test this one is when it dies pull the king lead off the distributor and stick a spark plug in the end and rest it on the block then crank it, if there's no spark or a very weak (orange/yellow) spark then it will be the crank sensor. 120k miles is nothing for these, mine is on 197k on the original pump etc, the only sensor that's been changed is the ECT sensor. Last edited by 360beast; Apr 20th, 2024 at 19:06. |
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Apr 20th, 2024, 18:46 | #5 |
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Jonsoft,I am not offering the parts, only suggesting that P505DEF is currently breaking a Celebration.Be kind to him, he has some health issues.
Have you checked the basics, like plugs, leads dizzy cap etc? Of course, If you are able to get used parts from P505DEF you can change parts, one at a time until you trace the fault guided by other experienced people on here. My Celebration has 175,000 miles and still has most original parts. |
Apr 21st, 2024, 06:51 | #6 |
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Last Online: May 22nd, 2024 18:37
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I had precisely this problem and it was sorted by new distributor cap and arm.
It really showed off. Even with a brand new battery it would show 9v all of a sudden then behave almost like it was totally flat. Come back to it, right as rain and totally unable to replicate the fault. Frustrating but rotor arm and distributor cap solved itm. The cap is a little bit tight to get at as it is close to the bulkhead. |
Apr 22nd, 2024, 10:39 | #7 | |
Go redblock or go home
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Quote:
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May 6th, 2024, 02:02 | #8 |
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You need to determine if its spark missing first.
When you are cranking it and it doesn't start check the rpm needle for slight movement. If it is moving it means you are getting spark trigger at the coil input. If not then most likely you have an ignition amp or crank sensor problem. |
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May 7th, 2024, 21:48 | #9 |
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Do you have an alternator from a 940 celebration
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