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Topic: 2-3 missing under load (Read 1220 times) |
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ro284
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2-3 missing under load
« on: Dec 4th, 2011, 5:39pm » |
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2-3 missing under load.holding back, and reluctant to rev, ive checked plugs, (4 electrode bosch,) coils seem ok, will do compression test tomorow, but it had a new head 12 months ago, when i start it in the morning i will see if there is a cold exhaust manifold as it warms up, any ideas please?
Thanks Bob
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Bob Dorset
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leewar
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Re: 2-3 missing under load
« Reply #1 on: Dec 4th, 2011, 11:36pm » |
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Have you cleaned the maf. Causes all sorts of running problems.
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ro284
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Re: 2-3 missing under load
« Reply #2 on: Dec 5th, 2011, 11:02am » |
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Thanks lleewar, i disconnected the maf, still had problem, no difference, have cleaned it recently, i thought i would test the coils by swapping them over first i noticed that the front coil would keep the engine firing on pistons 2 and 3. however the rear coil would not run on pistons 1 and 4, so i swapped the coils over to see if any difference, and only the front coil would run the engine on 2 and 3, (not smoothly of course!) but continuously, i suspect it,s a coil. in the meantime the speedo had shot right round the clock and stuck pointing down! what have i done? Also anyone got a 2-3 coil they could sell me,
cheers Bob
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Bob Dorset
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ro284
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Re: 2-3 missing under load
« Reply #3 on: Dec 5th, 2011, 4:05pm » |
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Just a bit to add re-symptoms, the tick-over is fine, and the car will cruse along nicely with no throttle, it is only when you press the throttle, it starts to get lumpy and stutter, i think it may be a coil pack, going by the previous symptoms and tests, but then it may be an injector or two, or something else, so any thoughts appreciated, thanks Bob
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Bob Dorset
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martin_rowe
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Re: 2-3 missing under load
« Reply #4 on: Dec 5th, 2011, 5:16pm » |
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Coils, plugs, the 2 HT leads, wiring to the coils. Any or all would be a starting point, wiring often gets a bit ropey right back to the bulkhead.
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Rally Drivers Do It Sideways
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5stud
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Re: 2-3 missing under load
« Reply #5 on: Dec 5th, 2011, 5:16pm » |
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have you had a good look at your top loom. you have a pm
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leewar
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Re: 2-3 missing under load
« Reply #6 on: Dec 5th, 2011, 7:33pm » |
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Bob, I have some coil packs available if you need them  . Just to let you know, I had the same problem. Car ran perfectly even on cruise until I pressed the accelerator. A cleaned maf and a change of coils cured it. Like yours, they must have been breaking down on load. Lee
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leewar
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Re: 2-3 missing under load
« Reply #7 on: Dec 5th, 2011, 7:35pm » |
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As 5stud say's, check the top loom for breakages.
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Mike H
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Renault Clio
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Re: 2-3 missing under load
« Reply #8 on: Dec 6th, 2011, 1:27pm » |
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on Dec 5th, 2011, 7:33pm, lleewar wrote:| they must have been breaking down on load. Lee |
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That makes sense 'cause need more Voltage at the plugs when the gas pressure in the combustion chambers goes up.
In case you haven't yet check the spark plugs gaps, they can unobtrusively wear out, in that the electrode(s) can be eaten away to nothing but still work. Until that is they don't want to any more 
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Mike H
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Stixy
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Re: 2-3 missing under load
« Reply #9 on: Dec 6th, 2011, 2:26pm » |
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Have you tried taking the vac pipe off the egr valve ? to stop the egr operating
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ro284
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Re: 2-3 missing under load
« Reply #10 on: Dec 7th, 2011, 6:11pm » |
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Thanks for replies guys, i have checked the top loom, no problems that i can see, also unplugged egr valve, no difference there. I agree with Mike H, as the car revs freely on all cylinders and only plays up under load, unfortunately i have had to struggle on and drive the car about a bit, (with difficulty and very high petrol use!) because my 12 valve is not taxed or insured yet, Still i have a couple of coils on order now, so hopefully that will do the trick,
however i still have a speedo that has swung right round since i have been fiddling about with the wires on the head, i have tapped the clear plastic and the needle flipped about an inch back but swung back to the wrong position again, is the speedo driven from the camshaft of auto box ? please, Thanks Bob
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Bob Dorset
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Tompion
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1997 2.3 Ultima estate.
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Re: 2-3 missing under load
« Reply #11 on: Dec 7th, 2011, 9:43pm » |
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Try an instrument reset:
http://www.fordscorpio.co.uk/instreset.htm
Turn on the ignition (no need to start it), press and hold the odometer trip button until the display changes. Turn off the ignition, when you turn it back on the needles will flick round & hopefully the speedo will return.
If it has got trapped the wrong side of the lower ledge repeat the procedure but give the top of the dash a thump when the rev counter needle has swung to the right (as it’s about to return), with any luck the speedo needle will jump the ledge and return.
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ABS multiplug wheel sensor pins MK IV or MK 20
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ro284
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Re: 2-3 missing under load
« Reply #12 on: Dec 8th, 2011, 9:55am » |
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Brilliant, that did the trick! thanks again Tompion,
Bob
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Bob Dorset
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ro284
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Re: 2-3 missing under load
« Reply #13 on: Dec 9th, 2011, 2:19pm » |
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All ok now yipee! Huge thumbs up to Lee, Got my coil packs today as he said i would.(well packaged) Thanks again buddy.
it was the pack i thought it was, so what i learned from testing was that the engine would not run on pistons 2 & 3 with one coil, but it would run on 2-3 with the other, so a gathered that if i changed the front coil with a good one it would run, which it did. Nice to have the car back, i have had 31 to a gallon on this car, but for a few days only 17!
Cheers all for all help and advice, Bob
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Bob Dorset
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Mike H
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Re: 2-3 missing under load
« Reply #14 on: Dec 9th, 2011, 2:41pm » |
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Congratulations! Well diagnosed peeps 
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Mike H
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leewar
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Re: 2-3 missing under load
« Reply #15 on: Dec 9th, 2011, 6:57pm » |
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Glad to help and to hear your back on the road Bob. Cheers Lee 
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