1989 740 B200E - UK

Hi Everybody

Have a niggling issue with our UK 1989 740 2.0ltr Auto(B200E engine). Need
some help please.

For years now the car had a slight tendancy to fire up on 3 cylinders
(sometimes 4 with a bit of a missfire on the 4th pot) which cleared ok by
blipping the throttle. A few months ago this got heaps worse and would not
just dissappear by blipping the throttle.

Car has been religiously serviced and maintained to a high standard from
new. Replaced plugs - genuine Volvo/Bosche, nope. Replaced king and HT
leads - one HT lead connection to the plug looked yucky - but nope.
Replaced the Distributor cap and Rotor arm (halfords own) and bingo all
seemed nuch better (actually this was hardly surprising as the car was then
still on its origonal Dist cap and rotor arm !)

That was 4 months ago in Oct 04. 2 weeks ago the firing on 3 started
again - Grrrrrrrrrrrrrr. Now we have been having some pretty damp weather
so will spray leads, king lead, coil, distributor cap etc with copious
volumes of WD40 and see what happens Wed morning - might drop lucky. Bye
the way all leads are sitting well on plugs, in dist cap etc.

Has anyone else experienced this. Please share experiences and what U did
to resolve.

Many thanks.

Andy

 

Assuming you have good compression, one thing you seem to have missed is
injector seals. If that doesn't fix the problem, see if you can find
out which cylinder is not firing. Then swap injectors from that
cylinder to another and see if the problem follows the injector.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

Hi Mike

Compression has not been tested but will look at if easier thing (that I can
do) fail to resolve. Car is fine after 30 seconds to 1 minute i.e. when
engine starts to warm up (which possibly points to damp ??).

I do not know which of the cylinders is not firing. Difficult to locate as
I have only a few seconds to locate. I can only try over a few days first
thing in the morning unless you have any other ideas - very welcome.

Had thought trying fuel injector cleaner but my experience of this
historically is that it is waste of good money.

Had thought of injector seals and when Son returns with car this evening it
is on my list to spray them with aWD40 and see if we have any leaks there.
I have experienced the seals getting hard and leaking before and on other
740's I have had. Last replaced on this 740 in Sept 99 so it is a
possibility although we do not appear to be experiencing an irregular
tickover.

Have also considered a leaking inlet manifold gasket but don't think it is
that - nothing obviously loose or leaking noises.

Andy

 

Either leaking injector seals (idle would be slighly "loppy" most of the
time), or more likely, a leaking injector flooding the offending cylinder
whilst the engine is stopped.

Tim..

 

On the list, not thought of that one.

Andy

 

I had a misfire at idle a while go. I too thought it was ignition
related and replaced all the HT electrics. Turned out to be the inlet
manifold gasket was leaking. This sort of problem tends to be more
obvious at low rpm - at higher speeds a small air leak is less
significant.

Get a squeezy bottle and with the engine running, squirt water over
the inlet tract. Include the injector seats, the manifold union, and
any hose connections. Avoid getting the ignition components wet. If
the engine note changes, or it stalls, you have a leak.

I also has a bad misfire shortly after cleaning the car once - water
had got to the inside of the distributor. Removing it and applying
WD40 solved this. But it would be unlikely to be a recurring problem
once it has dried out, unless the cap is damaged.

--

Stewart Hargrave


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