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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 : 14994 Replies : 314Users Viewing This Thread : |
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Apr 3rd, 2020, 23:53 | #151 | |
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However, if the dizzy cap is new, are you absolutely certain you didn't mix up the firing order of the HT leads when you fitted it? We have had this scenario before where someone interposed two leads and it gave a rough idle and wouldn't rev properly. Ash - can you post a pic of the correct layout of the HT leads please?
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Apr 4th, 2020, 03:34 | #152 | |
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Lead order left to right as you look into the engine bay is 4-3-1-2 |
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Apr 4th, 2020, 06:44 | #153 | |
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Last edited by Ammorack; Apr 4th, 2020 at 07:19. |
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Apr 4th, 2020, 10:14 | #154 | ||
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Well that's that theory laid to rest then! Doesn't really leave much now - i assume the air filter isn't blocked, no blockages between air filter and MAF, no blockages between MAF and throttle body and i seem to recall Ash got you to disconnect the exhaust to make sure the exhaust (including the cat) wasn't blocked. Cam timing has been checked, CTS checked and renewed, Lambda sensor renewed (not that it works when cold anyway), alternator has been checked - all tested ok. Another silly ignition related thought Ammo - can you check the coil LT connections? Blue should go to + on the coil and red/white should go to - Please check that is how the connections are and if not make them that way. If, after checking all you have left to check (no blockages in air filter, hoses from filter to MAF to throttle body, coil connections, carbon brush inside dizzy cap) that leaves me with a conclusion but check those things first.
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Apr 4th, 2020, 17:43 | #155 | |
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But the adjustment for Throttle, it says 0,15mm feeler gauge between throttle lever and throttle stop screw, a click should be heard. If not. Adjust to specs. I do not hear a click with 0,15mm gauge between. So should I adjust the throttle then? Last edited by Ammorack; Apr 4th, 2020 at 18:51. |
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Apr 4th, 2020, 19:32 | #156 |
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Your car should be with the diagnostic box at the engine bay, right?
If so, very easy to check the TPS! Everything seems TPS related, I didn't read the whole thread till now. Will do later Good luck, Kay |
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Apr 4th, 2020, 21:28 | #157 | |
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If so, as we've checked everything else and this is more or less a double-check of the TPS (which we've already done by disconnecting it so it would have revved above 3k if the TPS had been stopping it) that only leave the ECU as being the faulty. Unless Kay can come up with any other suggestions after reading it, i'm all out of ideas.
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Apr 4th, 2020, 21:39 | #158 | |
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I’ll adjust Throttle to specs later |
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Apr 5th, 2020, 11:50 | #159 | |
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Still not much difference in idle performance. Though I have cleaned the throttlebody Then I can adjust the idle on throttlebody then right? Last edited by Ammorack; Apr 5th, 2020 at 12:04. |
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Apr 5th, 2020, 12:24 | #160 | |
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It would have saved a lot of head-scratching and an incorrect conclusion (re the ECU) which could have cost you a lot of money to find out was incorrect! It would also have saved you having to take the dizzy cap off to check the carbon brush! If you remember, very early in the thread, Ash got upset with you and so did i because we had each asked you to perform checks that you didn't do and didn't report on correctly. I at least thought you had learned to perform the checks, exactly as they were asked and then give the results. You're lucky that you've put the correct results up and not spent money on a new ECU that wouldn't have been necessary! Right, back to the TPS, it's obviously way out of adjustment. Can you put up a photo of it so we can check that no numpty has fitted it upside down? Then i'll explain how to adjust it correctly. DO NOTHING ELSE - JUST TAKE THE PHOTO!!!!!
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