86 GT slight hesitation, bouncy oil pressure needle question

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Andy - 12 May 2007 14:12 GMT

I drove my 86 GT to work the other day. At lunch, I got in it to get
something to eat. After driving for 5-10 miles on the interstate, I noticed
that when I tried to accellerate, the oil pressure needle was pretty bouncy
(may not matter), the car would hesitate just a little and then it would
speed up. 1/2 way home my service engine soon light illuminated. I noticed
the hesitation more when I started from a stop. I was able to get all the
way home without breaking down but now I'm afraid to drive it to the shop
because I get the impression she isn't going to run much longer without some
attention. The service engine soon light did go off after a while but I'm
sure I still have some kind of a problem.

Not sure if that is enough information for anyone to have any ideas - my
thoughts were fuel filter or fuel pump. I have a new egr valve - that seems
to be a common source of problems. Not sure what else to try. I was going
to pick up one of those computer testers today and see if an error code is
stored.

Thanks in advance all!

Andy

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Andy - 12 May 2007 15:45 GMT

I just drove it to the gas station, and put a full tank of 93 in it, checked
the oil and added about 1/4 - 1/2 the bottle. It seems like the hesitation
becomes more apparent the warmer the engine gets. Started to do the same
symptoms on the way back from the gas station although I parked it before
the trouble light came on. Is my next step to check the computer with a
tester I guess?

>I drove my 86 GT to work the other day. At lunch, I got in it to get
>something to eat. After driving for 5-10 miles on the interstate, I
[quoted text clipped - 16 lines]
>
> Andy

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chrishizzle76 - 16 May 2007 21:33 GMT

sounds to me like your O2 sensor is going out or already is out. Or
you have a vaccum leak (likely possibility) because the engine is
losing too much power at once to take off.

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Andy - 17 May 2007 16:14 GMT

> sounds to me like your O2 sensor is going out or already is out. Or
> you have a vaccum leak (likely possibility) because the engine is
> losing too much power at once to take off.

Thanks Chris! You win the prize.

I took the car into my Pontiac dealer and he said the O2 sensor was
literally broken off. Unfortunately this caused my oil / air mixture to
become overloaded with gas so I need an oil change, new O2 sensor and they
were going to flush the engine and go from there. I guess they need to look
at the catalytic converter once this other stuff is done too. I'll update
this thread once they have gone through the stuff they know I need.

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chrishizzle76 - 19 May 2007 00:40 GMT

lol yeah it sucks... mine was broken off too. Seems like they do that
alot..

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