1998/99 Lantra misfiring

I have worked a lot on "old" cars. These new ones have a heap of
plugins that are simply completely different. :-<

Symptoms are:

- rough idle....sometimes. Maybe 50% of the time.
- at light throttle, the car farts about (intermittent misfire)
until about 3500 RPM, then starts to run OK.
- if I then put my foot down further, it feels sluggish, but again
picks up as the revs climb. It never feels quite right to me. It had
quite good zing before as the revs climbed.
- one plug lead was really tracking badly. Replacing that seemed to
help, but then the problem started again.
- one injector (4) is intermittently noisy. this doies _not_ seem to
coincide with the misfire!

I am going to replace all plugs and leads, and keep one set of leads
as spares if it does not help. Plugs may as well be done.

I guess the next step would be injectors (??). So at this stage my
question is: Could an injector be noisy for other reasons than the
injector itself. If so what?

If I am wrong about the next step, then where to? The TPS was
mentioned a couple of times. Again I could buy one and keep it as a
spare, if they cause trouble as everyine seems to indicate.

What do you do with these cars when one dies near some tiny town where
the local mech is used to tractors? <G>

Any help appreciated.
*****************************************************
I know I am wrong about just about everything. So I
am not going to listen when I am told I am wrong about
the things I know I am right about.

 

The spark plug wires were weak links on this car. You probably have
another arcing wire. Also check the plug porcelains for carbon tracking.
New factory wires appear to have been redesigned. If you have access to an
OBD-II scanner, a misfire should set a P030x code where the x represents
the number of the misfiring cylinder.

 

On Wed, 15 Sep 2004 12:55:53 -0400, "hyundaitech"
<> vaguely proposed a theory
.......and in reply I say!:

remove ns from my header address to reply via email

hehe! How did I know it would be _you_ that responded? You are busy
here, and much appreciated.

OK. Thanks. I will certainly do this first, as I said. I was told that
they break down even faster when the plugs deteriorate, as well.

If the plugs/leads don;t help, I shall no doubt return.

What about the noisy injector situation? Is there any other reason why
an injector should be noisy than the injector itself. I am wondering
about faulty electrics etc.

*****************************************************
I know I am wrong about just about everything. So I
am not going to listen when I am told I am wrong about
the things I know I am right about.

 

Well, I wasn't exactly certain what you meant by "noisy." You probably
already know this, but injectors make a clicking noise when they fire.
Odd noises could be caused by the injector itself or by the electronics
controlling the injector making it fire erratically. I've not known this
to be a problem and I've never experienced it on any carline.

 

On Thu, 16 Sep 2004 12:50:38 -0400, "hyundaitech"
<> vaguely proposed a theory
.......and in reply I say!:

remove ns from my header address to reply via email

OK. I found another bad plug lead.

NOTE: Your comment on their being improved is interesting. I actually
went "aftermarket" and bought Champion leads. Now I am not sure if
they will be not as good, but the genwine product certainly _looks_
better built. It is sealed both ends, whereas the Champion one is not.
It is one case where I would actually go genuine next time, in spite
of the savings (which was not that much actually).

Those leads are expensive!

"Noisy injectors". Embarrassment. I have had this car serviced
regularly under the warranty agreement, and therefore pretty much
ignored it, while servicing all sorts of other stuff that I own
meticulously. It was surprisingly low on oil for a car that was
erviced and has done only 75000 km (50000 M)! Right at the low mark. I
topped up and the noisy (Hydraulic lifter! :-<) has stopped.

Thank you for your efforts. Due credit to you, I was assuming wrong
things and providing wrong info.

*****************************************************
I know I am wrong about just about everything. So I
am not going to listen when I am told I am wrong about
the things I know I am right about.