Oh yes modern cars are so wonderful, Our Vectra that we used to own decided not
to run and along comes expert with diagnoses kit.
We are told that the ECU and crank sensor have both failed, yeek we are talking
scrappy take away talk here.
After replacing sensor to no avail we phoned a real old school electrician who
told us to replace fuel pump relay.
Car started instantly.
Still I have just got hold of some leather seats from a Vectra that seem just
right for the 2+2 and I only paid £30 the pair.
cheers
Jon 2+2 RST
----- Original Message -----
From: Jim Hearne
To: [email protected]
Sent: Wednesday, July 11, 2012 10:44 PM
Subject: Re: [Quantum Owners] CVH 2 litre Crankshaft Sensor
The reason that the coil pack can be damaged by faulty plugs, leads or
removing a lead with the engine running, is that normally the maximum voltage
the coil generates is limited by it jumping across the gap in the sparkplug.
If there is a break in the HT circuit or somewhere else the voltage out of
the coil can go far higher than it's designed to and cause the internal
insulation in the coil pack to fail.
I unplug the injectors in turn instead if i want to do a cylinder test on a
EFI engine.
And, the reason that most ECU's can't tell you theres a problem with the
crank sensor is that it's the crank sensor that the ecu uses to detect that you
are turning the engine over on the starter.
Without pulses from the crank sensor the ECU has no idea it needs to start
generating sparks and injecting fuel, it's sitting there waiting for you.
A crank sensor generates a higher voltage pulse output the faster the engine
is turning so if it starts to fail it will often fail next time you try to
start the car.
Jim
On 11/07/2012 21:59, Derek Clews wrote:
Thanks Michael,
It was a general recommendation as a preventative from an AA mechanic. He
said the bulk of the engine breakdowns on modern cars can be fixed by replacing
the coil pack or the crank sensor and they carry quite a number on each van as
a result. He said they can be affected by heat and age. Also they cannot use
a computer connection for most cars so are back to trial and error, backed by
experience!
Interestingly, he also said the AA recommend that if a coil pack has been
found faulty and replaced, the plugs and leads should also be replaced as it is
possible a problem with these could cause the coil pack to fail in the first
place. Also rough handling like pulling off the plug leads when the engine is
running can cause problems. (Did not do that!) Makes the modern systems seem
very fragile.
To support his view, the only time we had a breakdown in the old Punto my
son learned to drive on it was the crank sensor that failed. Basically it
drove normally, parked up and would not start again, no fuel & no spark. But
of course the car would not tell you what the problem was so you are stuck with
having to use a garage - that's why I like older cars! The basic CVH will
still run with the distributer loose, carb faults or whatever - not very well,
but it will run! Still, I am learning new ways...... part of the fun of this
particular project coupe.
Derek
On 11 Jul 2012, at 19:46, [email protected] wrote:
Your information might be correct but from my experience with a 1.6 turbo
CVH the weakest link might well be the connector rather than the sensor itself.
Michael
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