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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Electrical problem 940Views : 15667 Replies : 314Users Viewing This Thread : |
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Apr 1st, 2020, 20:58 | #121 | |
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No. It’s 0 227 400 196 And 0 280 000 946 Last edited by Ammorack; Apr 1st, 2020 at 21:05. |
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Apr 1st, 2020, 21:05 | #122 | |
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The NOID light will confirm my idea on the ECU, hopefully i'm wrong but so far, things are pointing to it. I assume you've done all the standard checks for leaky/broken/perished vacuum hoses on/around the inlet manifold and there aren't any leaks between the MAF and throttle body?
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Apr 1st, 2020, 21:08 | #123 | |
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Those ECU’s drove fine in another Volvo. But mine didn’t |
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Apr 1st, 2020, 22:07 | #124 | |
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*** EDIT *** Forgot to mention when i posted, try pulling the Orange wire off the TPS and see if it will rev then - i still don't think it will rev past 3000rpm but useful to confirm it. Refit afterwards if there's no change.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ Last edited by Laird Scooby; Apr 1st, 2020 at 22:20. Reason: Forgot to add another test! |
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Apr 1st, 2020, 22:09 | #125 |
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What about a missing phase on the alternator?
How about disabling the alternator and just running of the battery? |
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Apr 1st, 2020, 22:15 | #126 | |
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A missing phase might cause it if it happened under load but it's when the load is switched off, normal charging voltage exists as well.
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Apr 1st, 2020, 22:17 | #127 |
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And can overfuelling cause rpm limitations? The engine overfuels most of the time its not a big problem. I guess you can drown the spark, but it normally chokes and dies completely, usually only when the spark is weak.
Limitations are normalled cause by underfueling, or air leaks. But needs to be a pretty big air leak. Mine will run, just about, when the inlet pipe pops off, just enough to get back to the pits. |
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Apr 1st, 2020, 22:21 | #128 |
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I'm imagining spikes on the voltage due to some weird fault, but if its still restricted in rpm with the battery then I see why you've persued engine issues. Still current load on the alternator or battery should not help smooth running. Its a weird one.
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Apr 1st, 2020, 22:25 | #129 |
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Hi guys - I've been lurking so I don't get in the way.
Lights and other load on would lower the voltage across the electrical system. It seems like the ECU is responding to that lower voltage, or more importantly, misreading the no-load voltage. I'm not well enough versed in the black majic of the ECU itself to identify where and why this is happening (if it is the case). I also don't have the schematic in front of me atm, so I can't trace what may be impacting the ECU externally. If the fault is occuring on a known good ECU, that indicates the problem is external to the ECU. The cut spaghetti behind hte dash is a warning sign as well. Any thoughts out there? |
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Apr 1st, 2020, 22:36 | #130 | |
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I remember in particular a Mk2 Fiesta 1100 with the FoMoCo copy of a single choke downdraught Weber. It had been in the workshops for several days and none of the guys were getting anywhere. I'd recently joined as an autoelectrician so when i asked if i could have a go at diagnosing it, i was met with laughter and derision. However, they were all at their wits end so agreed. Took it a couple of hundered yards up the road, went back and spoke to my boss. He told me where i could find the part to borrow to prove the piont so i borrowed said part, swapped it and gave it a test drive. An extended test drive then returned and handed the keys to the senior (in age and company rank) mechanic and told him to go and try it. He was incredulous. Even more so when i told him the problem. He still wouldn't believe me so i gave him the original carb and told him to refit and try it and that what was on there came from a 1300 Escort we also had in the workshop. Then the penny dropped as to why it went so well. He hadn't realised i'd used a 1300 carb to prove the point. Every time the engine was called on to accelerate briskly (as in anything past very gentle acceleration) the carb would just empty bucketfuls of petrol into the engine so it was excessively rich and just bogged down because the mixture was too rich to fire. Dynamic flooding if you like. Purely caused by wear.
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