Couple of problems on 92 Tracker

[cwalker4205]

I have a 92 Tracker 4wd manual LSi hard top


The problem I'm most concerned with is a jerk when driving around town when cold. When I first start it up it has a normal idle, giving it gas it has a bad hesitation, I have a feeling that it could be a converter or clogged muffler. The problem persists until I hit about 45 mph, then its good until I have to slow down or stop. The part that confuses me the most is that after running for about a half an hour the problem goes away completly. The tach varies minimumly so it seems to me that it has fuel and fire but perhaps a clog somewhere.


The other problem is unrelated but after I shift into reverse I hear a loud clunk when I start to give it gas, and then again when shifting into 1st.


Any help would be greatly appreciated!

Thanks,
Chris

[CodyJ]

Check timing of the engine(last resort)... if you have already removed O2 and drove it around the block (don't force it out if it won't come but then its a missed test of backpressure and knowing if the CAT is clogged or not). Make sure the TPS is adjusted properly and works right. Tune-up on cap/rotor/plugs/wires? Inspect them! The temperature is geting to 180F? Nothing has changed and you have not been off-roading to damage the cat and it has not been running rich/lean I would suspect timing belt slipped and needs service or just a tune-up!

[jtgh]

ditto cody, tune up time.
and bad U joints.
not bad cat cuz ok at high speed.
is this a 92 8v or a 92 16v, ?

[cwalker4205]

it's an 8 valve, recent tune up and new O2 sensor last year. What baffles me is that if it's a 70 degree day then there is no problem

Thanks for your help

[jtgh]

jerk when driving around town when cold.

jerks violent can be spark related.
It wont be pump , ( we did have 1 poster that found a pump drop out only at 3500 rpm and no where else. one psychotic pump from hell)

it sounds like a TPS dropping out.

if you wiggle gas foot can you (tiny bit) will this effect the bad point?

the only cold , is baffling , to say the least.

moisture under the Dizzy cap?

intermittent fails, are never easy.

[CodyJ]

Check the timing... garantee I had simliar results and it ran okay on a hot day and was timed at 0 degree's.