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You have 2 fans. First fan should come on at 226*F, second fan at 235*F. Check the relays, in the box under the hood. Check radiator to be sure fins are clean, no bags stuck in front. Check level to insure radiator is full to the very top of the fill neck. If there is any indication of air in the system, use the two bleeder screws on the thermostat housing and the top hose to vent the air. Do not dribble coolant on the Optispark distributor.
Misfires when fully warmed up are often traced to faulty O2 sensors. With the 93's speed-density A/F ratio control, problems with the MAP sensor can cause issues, although that would be less temperature sensitive. There can also be problems with heat soak causing the IC module or the optical cam position sensor in the Optospark distributor to break down.
94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
Is it possible that the 2 issues are related? Such as the stumble issue is causing the higher temps?
One thing that is really easy to do to see if the problem is from closed loop control is unplug an O2. This forces the PCM into open loop all the time. If the stumbling problem goes away then, you know the problem is with the controls and not a thermal breakdown.
my 94 z was doing this i baught a new temp sensor but it didn't seem to solve my problem i changed the plugs and wires didn't work it turned out to be a faulty temp sensor plug the way i checked was i unpluged the temp sensor and ran the car didn't do it at all reconected the temp sensor and it was fine hasn't done it in over 6 months (it all started after i replaced my opti that is one of the sensors you have to unplug to replace the opti) hope this helps
Thanks everyone ... I appreciate the advice & suggestions.
I am not a parts changer ... don't have tons O' Cash if ya know what I mean.
Took it out on the highway tonight. Temperature guage was on the "3/8" hash-mark, where my other GM's seem to run. At 70mph in 6th, I try to accelerate on a flat road and it bucks and kicks, same as it does from a dead stop accelerate (mid to wide open throttle). Temp starts to climb ... then it settles back down. Does the same thing when driving around town. If I baby it ... stays cool until idling. If I drive a little more aggressive (mid-WOT) it will buck and kick and heat up. I am not losing any coolant.
I also smell gas in the back of the car and I do not believe it is a leak.
What software and connector do I need to hook into the cars computer?
Last edited by wolfspyryt; 08-04-2010 at 11:11 PM.