TD New Guy
Join Date: May 2016
Location: Columbia MO
My Ride: 89 Lancer Shelby
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Clunk under hard acceleration?
We're talking an '89 Lancer Shelby, T2, all stock, 76K. I've been having some heating issues which seem to be taken care of (cooler t-stat, better sealing radiator cap, leakdown test was negative. But a new issue is concerning me.
On long trips, I feel that the engine is occasionally working hard - we can feel it in the pedal, especially when it's on cruise. But what's bothering me the most is a clunk in the engine under hard acceleration at speed, or coming up to highway speed on an onramp. This is intermittent, and I don't have this issue around town. Codes are 12 (car was recently serviced) and 45 (I've checked for vacuum leaks; all good).
I'm wondering if this could be the start of a catalytic converter going out. I noticed ILUVSHELBYS mentioned checking the cat with a laser thermometer; I'll try that and report. But anyone else have an idea?
On another issue (the heating) - shouldn't our radiator fans run after the engine's turned off when it's hot?