To give you a little history of the problem... after warming up (and often
when going up hills), this 92 Excel stutters, and almost looses power, but
not all the time, maybe 75% of the time. At other times it seems to surge.
Spark plugs, cables, idle control, fuel filter, and oxygen sensor were
replaced, and the throttle body was cleaned. The symptoms have continued.


One mechanic said the Air flow sensor needed to be replaced and he pointed
to the throttle position sensor. This got me thinking (after I found out
what it was), and I blindly adjusted it. The symptoms did not change in
nature, but were markedly different. The next day, I had another guy look
at it and he adjusted the throttle cable. Again, the symptoms persisted
but worsened. This leads me to believe that this sensor is causing
problems and possible the root.

By the way... I live on a small island and the local mechanics have all
tried, but simply are not familiar enough with Hyundai's to fix this
problem.

It is now in my hands... I am mechanically inclined, but NOT a mechanic.
Any details you can offer are very much appreciated.

I've read that the sensor is very sensitive and needs to be adjusted using
a volt meter. I've asked around on island, and no one knows how to do this.
Do you know the specs for this, ie. voltage readings for open and closed?
Is there a way to tell if the sensor just needs to be adjusted or
replaced? Any tips for hooking up a volt meter would be much appreciated
(ie. which wires, etc).

Thanks in advance!!

-Parke

 

The throttle posisition sensor should be adjusted to .5V (.4 to .6) with
the throttle closed.

I'd start by checking your fuel pressure.

I'd also check your plugs and wires. I've had poor quality plugs/wires
cause issues even when new.

I will tell you that it mostly seems that these guys are guessing.
Really, it could be anything.

There could also be issues due to the idle actuator or throttle cable
being misadjusted.

Check www.hmaservice.com. Most of what you'll need is there.

 

Thank you very much for your reply.