The rev counter looks for negative going pulses on one of the coil
wires, the coils are earthed and then released to make a spark.
If the supply to the coil is intermittent then the voltage will drop on
the coil that isn't sparking when the other coil fires.
Therefore the rev counter signal could contain twice as many pulses as
it should and read twice the RPM.
I'm sure you know but the coil pack effectively contains 2 old fashioned
ignition coils in one package.
Another thought, is, does the car have an alarm or immobiliser, a
favourite circuit to cut for the immobilisation circuit is the feed to
the ignition coil.
It's not unknown for the wires to have been twisted together.
The coil plug should latch very tightly if it's the correct connector.
Jim
On 24/03/2014 19:08, steve c wrote:
Hi Jim and Martin
Thanks for the responses, I agree that the connector does suggest that
the problem is there. The coil pack is indeed a new unit, and I've
tried cleaning and adjusting the contacts in the plug as best I can.
I've actually had the plug and wiring off, as I extended to wiring for
the plug (spaced out soldered joints using wire of same gauge) as it
was strung across the engine bay like a taut washing line. I just
can't see how the plug having a poor connection would cause the revs
to jump up and down, I'd really like to get a new connector plug, but
I'll take to existing one off again tomorrow and have another go at it .
The way the plug connects to the coil unit seems lacking positivity,
I've tried adjust the spring, but as the "shoulders" for the connector
on the coil unit a sloped it will pull away somewhat. I'll get them
both on the bench as try and ensure a good connection, and may see if
I can do a permanent wiring job on the old unit by soldering wires
directly to the pins as an alternative and try running it like that
until I get a new plug connector
It may be that' there more than one problem and I'm mistakenly trying
to find a single source .
Cheers
Stevie Cee
On Monday, 24 March 2014 17:57:22 UTC, steve c wrote:
Hi All
Any thoughts, suggestions or help on the following issue with a
1.6i mk3 XR2i engine in my son's H4. I'll go through the issues as
they've come up.
The car would occasionally die, and my son had also reported that
it kangaroo'ed - the rev's "randomly rising and falling (seemed to
happen if the car was hot, as it was always OK when I got to it in
my role as IR)
On any occasion it was dead, I found there was no spark, and
simply wiggling the connector on the solid state coil pack would
seem to bring it to life.
I took the plug and a length of cable off the car and inspected
and cleaned the plug - which all seemed ok - when the problem
persisted I bought a new coil pack. when I swopped this, I had a
problem with the car, it ran OK in neutral, but when trying to get
off the drive, up hill, it sputtered,back fired and died. I
swopped the coil packs back, and checked they were exactly the
same, which they were. I became convinced having had the plug
leads on and off the coil pack a number of times, that I'd messed
the firing order up. I traced the leads and labelled them, put
them back with the new coil pack and all was seemingly OK ( the
car has previously had new plugs and plug leads as part of a
"service")
The problems with car dying and reported kangarooing continued.
I've checked all the breather pipes as suggested by Haynes, and
also changed the fuel filter, as it was suggested to possibly be a
fuel problem (despite the strange wiggle the connector fix for no
spark) one other slightly strange thing occurred during the
issues, the rev counter packed up. I had a look at the wiring
diagram and couldn't figure it out, clearly wasn't a feed from the
distributor!!
I used the car for a couple of journeys, and experienced the
Australian phenomena. It initially seemed as if the car was in the
wrong gear, and slipping the clutch and upping the revs got
through it, but later I had the full kangarooing and random revs,
followed by the engine dying. A quick check under the bonnet when
it wouldn't restart and a wiggle of the coil connector and away we
went.
I was working away and didn't have the time to do any more work on
the car until recently. I checked everything over (connectors etc)
and tried to get a replacement coli lead with wires attached, but
my local ford breakers have shut down, and my inquiries have so
far proved fruitless.
I tried the car out late last week, having finished working away -
it wouldn't start, but the jiggle trick sorted it. I now noticed
the rev counter was working again, but seemed to be showing
incorrect readings (c 3000 revs for a fast tick over). The car
seemed OK, but trying to get it off the drive revealed the
sputter,back fire and die, problem had returned. I convinced
myself that the nature of the issues, suggested that the ECU must
be at fault. Haynes suggests that if any of the various sensors
have issues the engine is likely to run but not at optimum, so I
found one on E bay and bought it. It arrived today, and chnaged it
out - and I've got exactly the same problems with the car - rev
counter works but reads high, and the engine fails under load.
oh for the days or carburetors and points
StevieCee
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