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Topic: 2.3 16 v runs on 3 cylinders (Read 504 times) |
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larsen
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2.3 16 v runs on 3 cylinders
« on: Jul 6th, 2007, 7:46pm » |
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hello big trouble.
my 97 2.3 16v runs only on 3 cylinders have checked coils replaced wires and checked compression 12-13 kg each any ideas please
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Matt
Senior Member
Manual 24v
Posts: 2816
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Re: 2.3 16 v runs on 3 cylinders
« Reply #1 on: Jul 6th, 2007, 7:59pm » |
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check the wireing to the fuel injectors, the sheath cracks, possible the bare conductors are touching and shorting out the injector.
how have you tested the coils, 2 cylinders fire at the same time (shared coil) so if only one cylinder is not firing its unlikely to be the coil.
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FDS2000 Scans - Birmingham
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larsen
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Re: 2.3 16 v runs on 3 cylinders
« Reply #2 on: Jul 6th, 2007, 8:09pm » |
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thanks for the answer matt. i forgot to write that there are no spark on the plug.
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TiberiuS
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Ex. 1996 2.3 Ultima - RIP P789 KHJ
Posts: 2257
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Re: 2.3 16 v runs on 3 cylinders
« Reply #3 on: Jul 7th, 2007, 6:34pm » |
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Hi. I remember a post saying that there are two coils inside each pack, could be one has given up the ghost...if you have a multimeter and measure the primary resistance of each coilpack, that might show it up.
If you know what cylinder is missing, swap the coils over and see if it moves. If it's only one cyl down, it can only really be the coil or HT lead that goes to no.1 and no.3 cyl, any loom damage would kill two cylinders at once...worth checking the loom though as Matt says, mine was falling apart round the back of the cylinder head.
Good luck.
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Bruce - '07 Jaguar XKR coupe, '95 Jaguar XJ Sport 4.0, '82 Ford Capri 2.0 Ghia, '15 Honda Civic (sloooooww..)
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mindofitsown
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Re: 2.3 16 v runs on 3 cylinders
« Reply #5 on: Jul 10th, 2007, 1:38pm » |
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Hello Larsen,
Following your topic with interest because I had the same symptoms about 3 weeks ago. I was convinced the problem was the wiring loom and most of the postings were about finding the part number etc. It turned out to be a duff coil pack which when test on the bench seemed ok. The most relevant posting is copied below for you, hope it helps!
"I finally fitted the new loom plus new plugs (as the gaps were about 2mm+) and new HT leads for nos 1 and 3 cylinders (as these were almost black with heat damage). Started it up and.........same problem still there!!! i.e. one cylinder not firing.
I decided to go back to basics again and confirm what's going on and then I discovered this time No1 cylider is not firing whereas it was No3 before. Then it dawned on me that when I removed the coil packs for bench testing, I had inadvertantly replaced them in alternate locations (which is no problem normally as they are identical). The fault had moved to a different cylinder and was following a duff coil pack around. I got a new coil pack (£55+VAT!!!) from local FMD and hey presto, fault gone and my baby is on the road again!
The interesting part is that I had tested both coil packs with a DC power supply on the bench and sparks were abundant so why was one section of one pack failing when in situ? I had checked the resistance of the windings and it was OK. I can only presume that some internal leakage was occuring which was not bad enough to prevent a spark under ideal bench conditions but still bad enough to inhibit a spark under gas compression conditions. Moral.....bench testing doesn't always prove things unless you simulate the conditions of use which in this case could have been done with an artificially large spark gap to really test the efficiency of the coil. "
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