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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Chasing a slightly lumpy idle...stillViews : 7910 Replies : 164Users Viewing This Thread : |
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Aug 19th, 2018, 22:23 | #51 | |
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Excellent advice, thanks again Dave! I’ll get onto it this week. I’ve just got back from a 4hr round trip in it and it didn’t miss a beat bar the issue we’ve been collectively chasing, drove very well indeed in general! I’ve been running it this week on firstly a tank of BP Advance and then a tank of Shell V-Power. It seemed initially that the Advance made the idle/hesitation a little worse, but I’m not sure what that indicates/doesn’t indicate.
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Aug 19th, 2018, 22:58 | #52 | |
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My redblocks always ran best on BP Ultimate and strangely, the B280E/PRV engine it's a toss-up between BP Ultimate and Shell V-Power Nitro - both being the high octane versions. None of my cars like Esso (or Tescos - strange you now get Clubcard points on Esso fuel - very little help!) but the Rover 827 prefers BP Ultimate as well. The bonus for me with that is BP supply Sainsburys (hence Nectar points on Sainsburys fuel) and the strangest of all, recently the B280 760 i've got now has "gone off" Shell V-Power Nitro, preferring a diet of Sainsburys/BP Ultimate. Anyway - i digress - maybe now it's your weekend you'll have a chance to have a look for the ignition advance vacuum hose that feeds the EZK unit and make sure it's connected - would be great if that is the problem! One other thought i had - is yours K-Jetronic or L/LH-Jetronic Phil? I@m sure you've posted photos of the MAF so i'm going with LK-Jetronic but the brain cell is having a funny five minutes! I know on the B230E i had last, the injector "O" rings were Jacobs'd and were leaking which caused a randomly rough idle. The two sets (top and bottom) came out about £18 from Volvo, if yours is K-Jet it might worth checking those. Likewise with the bottom "O" rings on the injectors if it's LH-Jet, just to be on the safe side.
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Aug 20th, 2018, 12:17 | #53 |
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Well I got the B230FT in the 360 running again after an upgraded cam (going from T to A) and new adjustable pressure regulator. It is even more lumpy now, but I didn't check the valve clearances, which apparently I should have done. From memory the 360 it came out of was quite lumpy / missy aswell on idle (and not running any O2 sensor so probably on the rich side).
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Aug 20th, 2018, 14:28 | #54 |
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Also interesting on the vacuum load input on the older EZK ignition, the LH2.4 (+EZK) uses air flow as the load signal (ultimately slower response though sadly). This is read by the LH fuel computer and communicated to the EZK.
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Aug 20th, 2018, 14:37 | #55 | |
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That means if Phil can't find a stub on the EZK or a hose to feed it, his is slightly more modern than i think it is.
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Aug 20th, 2018, 15:31 | #56 |
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No stub or hose in sight on my EZK alas, it's the B200F which has the MAF and the LH 2.4 Jetronic system...the plot thickens!
Could it be the MAF or an injector not firing properly?
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Aug 20th, 2018, 15:47 | #57 | ||
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Sounds daft but have you checked the inlet manifold nuts/bolts for tightness? I was just thinking about squirting some WD40 or Eezi-Start round the injector bottom seals with the engine idling to see if anything altered and it crossed my mind that it's not unknown for the inlet manifold gaskets to go weak, or simply be just plain loose.
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Aug 21st, 2018, 10:11 | #58 | |
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Another thing I’ve noticed, the car has a modern stereo head unit, but the aerial is missing from the car so the radio itself doesn’t work. However, when I plug my phone/iPad into the aux input, I can play mp3s or streamed music. This is no problem, but when I plug a car charger into the cigarette lighter and connect it to my phone whilst it’s connected to the stereo, there is loud and insistent electrical interference introduced into the signal. Could the radio suppression relay be faulty? If so, would this introduce electrical “noise” into the system and cause embuggerance with ECU/EZK ignition/timing/fueling maps?
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Aug 21st, 2018, 10:34 | #59 | |
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Is there a chance you can take a video of it idling and upload the video? About 30 seconds should do it, just so we can all hear what it sounds like. As for the interference when using the charger on your phone, have you tried a different charger and is it a genuine one for your phone or a Chinese thing for 99p off ebay? The sole function of the RSR is to provide a feed for the injectors, Volvo in their wisdom found it reduced radio interference from the injectors when running. As such i doubt very much if it's related to the interference you get on your music when using a charger on your phone. First thought would be the charger, hence the questions above! I get what you're saying about something causing interference to the ignition map, it could be a faulty or loose knock sensor, they're not meant to be that tight but if memory serves correctly, should have threadlock on the securing bolt thread tp prevent the bolt coming loose. Might be worth checking, fairly sure they're a piezo-electric device so unplugging it should provide a simple go/no-go test (although it may put the ignition map into default minimum advance) to see if it is causing the occasional timing malfunction. I'm hoping you know where it is which would save me breaking the bad news that it's under the inlet manifold, roughly speaking between #2 and #3 inlet tracts.
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Aug 21st, 2018, 11:49 | #60 |
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You could be right about it being as good as it gets. Something feels a bit amiss but there has to be a limit when it comes to “firing the parts cannon” at the car!
I’ll check the knock sensor and see how it all looks. The Bosch units are cheap enough so I may replace it just to be sure. The charger is a Halfords unit which was about £15 as I recall...it’s the only one I could find that was long and slim enough to fit the deep cigarette lighter socket in 7/900s!
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