Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: pauls on 03 July 2015, 19:23:07
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What controls the movement of the rev counter is it electrical or wire. I ask because sometimes it jumps of the line and sometimes it doesnt. Dash is seated correctly. Everything else on the dash is fine
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Thought this was one of the "battery symptoms?"
It's electronic, from abs sensors on drive shafts I think.
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Thought this was one of the "battery symptoms?"
It's electronic, from abs sensors on drive shafts I think.
This is what iam trying to figure out. Because one day its fine and next day its jumping. It also seems to tie in with the gearbox thing as well
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Right, so bettery didn't fix it then. :(
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Could be an alternator voltage issue :-\
On the V6 rev counter could be either alternator or crank sensor driven :-\
ABS sensors feed speedo :y
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Right, so bettery didn't fix it then. :(
No it didnt :'( but I still believe its electrical fault. I surpose next step is to get alternator tested. As stated before had a look at kevin woods thread but no real answer from it.
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On the subject of electrical, I noticed the black rubber insulation on the thinner of the two wires going to the starter motor was split and inside it had silver insulation. I couldnt see any wire split though so just wrapped it in insulation tape. Would this cause a issue
if I want to mess with this wire would it be wise to take the life off the battery.
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I would say when dealing with anything alternator related-on the electrical side anyway-I'd always disconnect the battery.Unless of course you're checking its output!
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pauls, I may have said this before (maybe not to you), but Kwik-Fit, ATS, Halfords and others will do a free crank/capacity test on your battery and a charging test on your alternator; that will at least confirm or eliminate a few things for you.
Ron.
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pauls, I may have said this before (maybe not to you), but Kwik-Fit, ATS, Halfords and others will do a free crank/capacity test on your battery and a charging test on your alternator; that will at least confirm or eliminate a few things for you.
Ron.
yes you have said before and iam going down in the morning. :y
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Yes brain fade on the abs sorry.
Believe I did suggest crank sensor as a possible a while back. Seem to remember a post where the c/s was changed and the Rev counter behaved there after.
Really needs some proper diags though tbh. Might be worth a trip to Brackley. ...?
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Could it be an ABS ECU problem?
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Could it be an ABS ECU problem?
My ABS ECU went pop recently, and it also logged gearbox fault, replacement ECU cleared it all up.
So could be something along those lines??
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Worth a look at by a Tech 2 perhaps.?
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Iirc the stutter/pause from the Rev counter is from tickover rpm to ~1200rpm and is intermittent. It occurs in neutral at standstill and in gear. (Again iirc) so if it's doing it at standstill there wouldn't be any abs signal anyway.
If it was just this fault along I'd try swapping the clocks out for a know good one. BUT there are other faults that occur at the same time. There is an intermittent lag in power at roughly 5k ish rpm like it's about to change gear but doesn't. I don't think it's a miss fire as its too subtle and smooth, it's like a partial lift off from wide open throttle. Except the pedal is flat to the floor.
There is , I believe, a gearbox shift point be fudllmemt as well that I don't think I've experienced having driven it.
Maybe Paul could confirm?
But what could affect those three things?
To my simple mind, Crank sensor "could" affect all three. But then so could gear box ecu. (I have a spare here Paul if you want to try it) I haven't seen anything to suggest speed signal,(again apologies I was confusing my tacho issues with Pauls earlier) but then I have way too little experience with electrical diagnostics to be sure of anything.
It really does need a chat with tech2. And quite possibly a damn good talking to ;D
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There is , I believe, a gearbox shift point be fudllmemt as well that I don't think I've experienced having driven it.
The gear box issue is difficult to explain but I know chris felt it at the higher end , while driving it both normally and pushing on it will go to change gear and you get what feels like a push/pause gear changes up then away you go.
another way I have tried to explain it is just as it changes you run over a bump in the road.
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Ah ok. Same thing then.
So both intermitant, and both occur roughly together, or not at all ...? Generally speaking?
1 rev counter jumps (both in neutral and in gear)
2 Hesitation under power
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Ah ok. Same thing then.
So both intermitant, and both occur roughly together, or not at all ...? Generally speaking?
1 rev counter jumps (both in neutral and in gear)
2 Hesitation under power
yes both are intermitant seem to be together.
rev counter jumps both in nuetral and in gear from 0 to 1000 revss depending out how hard you press the pedal.
no hesitation under power from what I can feel
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Are the revs jumping with the rev counter, or is it just rev counter jumping independently of anything else. If latter, don't rule out instrument panel failure, and unrelated to power/gear glitch.
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Are the revs jumping with the rev counter, or is it just rev counter jumping independently of anything else. If latter, don't rule out instrument panel failure, and unrelated to power/gear glitch.
Revs only jump when you press pedal
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Engine revs seem absolutely normal when the Rev counter jumps.
That's to say there is no difference in engine noise and response on any occasion, yet the needle jumps intermittently.
If it was just this symptom then yes I'd swap clocks out. But the inference is that the hesitation at high rpm also seems to rear its head at the same sort of time. As if the two are "possibly" caused at the same time by the same thing.
I think Pauls is fairly convinced the two are related sonehow. Although may not be.
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Have you got an old analogue meter to check voltages at the point this happens? Looking for voltage spikes, particularly from alternator?
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Any overvoltage codes ever stored in any ECU?
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Have you got an old analogue meter to check voltages at the point this happens? Looking for voltage spikes, particularly from alternator?
No I dont have a analogue meter.
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Any overvoltage codes ever stored in any ECU?
No codes stored.
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Update..
Had battery and alternator tested at kwik fit. All came back as working as it should.
Now what??
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Since replacing wirring loom about 2 weeks ago this has raised its ugly head again. Did pedal trick today and no codes.
Any new thoughts please.
P.s. i dont know how or why it went away