Omega Owners Forum - Holding revs too high & misfire

hotel21

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Holding revs too high & misfire - not ICV
27. Sep 2007 at 20:47

OK peeps, a wee puzzle and a Q or two ...

My beastie now regularly runs away with itself and holds revs circa 2 - 2.5 k when warm and the only way it can be dropped is to brake whilst in gear and force the revs to drop. Even then does not work every time. Air leaks checked and none apparent. ICV rubber to intake replaced with 2 spares.

There is a slight misfire/hesitation when accelerating from low revs/gears until circa 4k revs then it picks up clean.

Belt, tensioners and timing replaced/set/confirmed by M_DTM and TB at the nearly Wales meet.
VERY slight oil in plugwells but now dry and leads are in first class condition.

HBV replaced at first hint of suspected leakage/non performance with VX gen original so DisPak thought A1.

ICV cleaned, oiled and swapped between the three I hold in stock..... Sad

Second replacement front multiram electric actuator fitted but still apears non working (cheers Timbuck for the first and FFCGary for the second... Thumbs Up!

)

I fitted cruise myself several months ago and it still does the same when cruise is disconnected - both electrically and mechanically from the throttle bodies - and I am now at a loss.

Anyone any edumacated clues or guestimates?? Undecided

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Entwood

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Re: Holding revs too high & misfire - not ICV
Reply #1 - 27. Sep 2007 at 20:55

Don't know if its FBW or throttle cable .. if the latter.. I had a similar problem on the MGB years back .. it was a knackered throttle cable .. replaced it all OK .. took old one apart .. as you do

.. and it had 2 broken wires about 2/3rds along .. seems these were catching on the outer sheath and acting like a little spring putting tension on the cable. as the damage slowly got worse the problem got worse..

just a thought ??

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hotel21 Administrator Offline Posts: 12766 Doghouse Gender: Drives: into lamposts	Re: Holding revs too high & misfire - not ICV Reply #2 - 27. Sep 2007 at 21:05 Thanks for that. Its a cable, prefacelift 3.0 MV6.
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Markie Omega Lord Offline Posts: 7914 Lanarkshire, Scotland Gender: Drives: RS4, X5, Range Rover	Re: Holding revs too high & misfire - not ICV Reply #3 - 27. Sep 2007 at 21:07 an overnight issue Brocie, or gradually getting worse? Idle spot on the button?
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Entwood Omega King Offline Quietly Confident Posts: 13708 North Wiltshire Gender: Drives: 3.2 Elite (with LPG)	Re: Holding revs too high & misfire - not ICV Reply #4 - 27. Sep 2007 at 21:07 Then I'd try disconnecting the throttle cable and checking for free and untensioned movement .. it it snags or pulls I'd replace it ... (but I have no idea if that is easy or hard !! )
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hotel21

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Re: Holding revs too high & misfire - not ICV
Reply #5 - 27. Sep 2007 at 21:08

Pretty much ongoing.... Much more noticable after the belt/tensioners/front multiram actuator done at the last meet. Sad

Idle is spot on, with and without aircon. Inst Consumption 0.2 gall/hr or whatever when on eco or aircon off, 0.3 when on...

As to free cable, will check in the morning but, TBH, dont think that is the case... Thumbs Up!

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« Last Edit: 27. Sep 2007 at 21:10 by hotel21 »

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Markie

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Re: Holding revs too high & misfire - not ICV
Reply #6 - 27. Sep 2007 at 21:11

hotel21 wrote on 27. Sep 2007 at 21:08:

Pretty much ongoing.... Much more noticable after the belt/tensioners/front multiram actuator done at the last meet. Sad

Idle is spot on, with and without aircon. Inst Consumption 0.2 gall/hr or whatever...

So were looking at something that was interrupted last time and hasnt settled again....

that iacv is really tight in isnt it and not at an angle....?

in mine the grooves on the rubber are out of sight when its in correct BUT when doing the breathers on Bobs i had a similar experience and it transpired ICV was not in far enough

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hotel21 Administrator Offline Posts: 12766 Doghouse Gender: Drives: into lamposts	Re: Holding revs too high & misfire - not ICV Reply #7 - 27. Sep 2007 at 21:13 Yup, rubber is well into the plenum, no grooves are visable. tried swapping out with the others I have as well, in case its a split or overly soft.... No change..
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Markie Omega Lord Offline Posts: 7914 Lanarkshire, Scotland Gender: Drives: RS4, X5, Range Rover	Re: Holding revs too high & misfire - not ICV Reply #8 - 27. Sep 2007 at 21:16 dispack can have issues regardless of HBV how known good is it, may well be on way out any idea of dis history? similar issues on one of mine, asmentioned , was fixed by a combo of leads, dispack, crank sensor and breather clean here - trouble is i now dont know which one finally cured it
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JamesV6CDX Ex Member Gender: Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather	Re: Holding revs too high & misfire - not ICV Reply #9 - 27. Sep 2007 at 21:17 Brucie, I know you don't suspect the cable, but I just wonder if there is something from stopping the throttle bodys from entirely closing.. Other than that, what are your plenum O rings like (I cant remember).. Air filter ok?
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hotel21

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Re: Holding revs too high & misfire - not ICV
Reply #10 - 27. Sep 2007 at 21:25

I flashed the codes as well. 15 and 31 when off - Coolant Temperature Sensor (CTS) High voltage and Engine RPM signal (crankshaft sensor) No signal - but the latter obviously clears when engine running.

Would the temp sensor have any input into this, bearing in mind we reset the assorted settings on the dash binacle to get the temp display back into range???

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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Holding revs too high & misfire - not ICV Reply #11 - 27. Sep 2007 at 21:28 Could the butterflies be sticky? CTS, causing warm up program? Failing MAF reading high airflow, ecu pumping in fuel to accomodate?
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TheBoy

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Re: Holding revs too high & misfire - not ICV
Reply #12 - 27. Sep 2007 at 21:29

hotel21 wrote on 27. Sep 2007 at 21:25:

I flashed the codes as well. 15 and 31 when off - Coolant Temperature Sensor (CTS) High voltage and Engine RPM signal (crankshaft sensor) No signal - but the latter obviously clears when engine running.

Would the temp sensor have any input into this, bearing in mind we reset the assorted settings on the dash binacle to get the temp display back into range???

I replied at same time. If Engine ECU CTS is reading low temp, it will be on warm-up program. Different sensor to dash gauge (though mounted next to each other)

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hotel21 Administrator Offline Posts: 12766 Doghouse Gender: Drives: into lamposts	Re: Holding revs too high & misfire - not ICV Reply #13 - 27. Sep 2007 at 21:29 Dispack is untouched from getting the car (2 years ago now) so parentage unknown. Maint History is quite good with lots of (expensive) receipts for work done, no mention of dispack so probably original.
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hotel21 Administrator Offline Posts: 12766 Doghouse Gender: Drives: into lamposts	Re: Holding revs too high & misfire - not ICV Reply #14 - 27. Sep 2007 at 21:31 Cheers TB but revs are a lot higher than the warmup 1500 or so. Talking 2 - 3k rev range. At idle, revving much more than I want it to be...
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