on a ten year old troope with a little over 64,000 miles, just noticed the
check engine light on but then it turned off
the timing belt and tensioner (pusher) were replaced over a year ago
am I correct in assuming that at some point close to 65k miles, the light
will turn on or is this perhaps some other unrelated situation (ie. oxygen
sensor etc) ?
in case it matters, I've had to switch to premium unleaded several months
ago to stop pinging
Is this a '95 Trooper? Then I imagine it has and OBD-2 system (On
Board Diagnostics ver 2). The engine control computer turns on the
check enginer light when it detects something is not right with the
Probably it is related to your having to switch to premium gas... I'm
assuming your manual doesn't indicate premium is required. The engine
should have an anti-knock sensor which the computer monitors. When it
detects knocking the computer retard the timing to make it stop. If
it can't do it then something's wrong.
Take it to an Autozone, they will connect to the diagnostics port and
read the trouble codes for you.
Not sure PepBoys will do it... it's an AutoZone thing.
If it is an OBD-2 system the computer will store trouble codes even if
the light isn't on. The computer uses a fairly complicated algorithm
to determine when to set the light: based on things like type of
problem detected, number of consecutive starts, driving pattern (miles
driven at given MPH), and how many times the error is detected.
In your case, you know you have a problem since the engine pings when
it really should not.
I don't think the lamp lights when it's time to replace the timing
belt based on mileage... at least, I've never heard of it on Isuzu's.
My Rodeo certainly didn't... I replaced the timing belt at 90K. It's
really not so critical on these V6 engines since they are not an
interference design. Check your owner's manual, it should have some
information on it if that is the case.
There are a number of things that can cause the check engine light to come
on. One thing to keep in mind though, the check engine light is really an
emissions control system diagnostic warning. It can come on for reasons as
simple as a gas cap not being on tight. Also, I would try to find an
Autozone for the code check, Pep boys will charge you $75 to read it and
reset the codes.
Brett W. Rohlfing
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