Question about 1995 Chevrolet Camaro

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Various sensor issues, car just won't seem to ever run quite right.

1995 camaro, 3.4 liter V6. 191,500 miles. 5 speed manual (borg warner T5?) Has tempermental attitude, sometimes it runs great, other times ( most times) it develops a stutter that will make a noticable jitter you can feel in the shift knob (shaking) in 2nd -4th gears from about 20 to 40 MPH. You can tell it still wants to do it in 5th but the gearing is so high at that point its barley noticable anymore at about 40 mph. Disappears entirely on the HWY. New plugs did not help. If you engage and release the gas pedal slowly while driving it seems like it wants to go away but comes back as you steady your foot once again. Sometime a good cleansing quick rev-up to 5000 rpms will make it go away for a minute or two. It will also sometimes steady out after a long drive on the hwy. Sometimes the jitter will present itself at high RPM's (above 3500) under heavy acceleration as well but is cured after releasing and reflooring the gas. Egr valve, crankshaft sensor, both O2 sensors and the TPS have been replaced with new parts (Schmucks auto supply. Niehoff tps and egr, bosch O2, crankshaft sensor unknown, done at shop). As far as I know, the rest of the sensors are original. Catilitic converter has been gutted. Flowmaster muffler installed, didn't seem to affect the power one way or the other. Other annoyances include a cut out of one piston every once in a while under heavy acceleration between 3000 and 4500 rpm. Plug wires are 1 year old with lifetime warranty (Napa's' nicest set of wires for the car) and the plugs are new as of 2 months ago, (Autolite Platinum.) The accelerator seems to have "sweet spots" in certain parts of the powerband where it will have more power at 60-80% throttle than 100 but then will give a nice burst again right after being re-floored from the lesser position. The various sensors and valves that control the engine seem very slow to respond to the postion of the TPS. all problems used to be a lot worse before TPS was replaced. Also, the car tends to not want to start without the gas being held to the floor after being run to full operating temp, shut of for 5 to 10 minutes and then started again. It just drops the ball, sputters a time or two and dies. 10 to 20 seconds of holding the gas to the floor and cranking the key gets it to fire off eventually. Sometimes, if your lucky, if you catch it just as it seems to want to fire with just a tap on the gas 1/8 to 1/4 this can be avoided and the car will start. Disconnecting the metal tube that goes from the EGR to the intake seems to cure this issue. (It is not plugged.) Even when all these sensors and valves were bad, the motor ALWAYS fires right off when its cold, then and still. I know its also possible I have a valve sticking or some other mechanical error. At 190+ thousand miles it could be any number of things. Sticky Injector(s) maybe. Bad coil? Weak fuel pump? Ive had this thing on a $2000.00 computer reader and it came up with the O2 sensors, the crankshaft sensor and the EGR as issues. It didnt even catch the TPS, I replaced it on a hunch. All have since been replaced and replacement of these parts did help a lot except for the EGR, the new EGR made the starting problem return after I had solved it by replacing the TPS and caused the piston misfire problem. Replacing it actually made the car run worse. I haven't run a computer test since. Only other problem i can think of is that the check engine light often comes on after de-celerating for more than 9 or 10 seconds, especially down a hill. After 5 or 10 minutes, it usually shuts back off. Other than that, the motor barely leaks any oil though it does get dirty fast (starts getting quite dark at 2000 miles) , doesn't smoke and gets about 18 to 25 mpg in town(lead foot syndrome) and 25 to 30 on the hwy. It's not the fastest camaro, thats for sure, but the low-end torque of the 3.4 is definatley still there and if you want to go up a steep freeway pass faster... 80, 90 mph or above, it will without any trouble. Shifting out of 5th gear for most hills on a average 55mph hwy is not neccesary. The motor definatley has full power at low RPM's. (3000 and under.) Any thoughts are much appreciated!!!

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    yadayada May 11, 2010

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Check the coolant tempature sensor it is going to be located on the block. this sensor will make it not want to start without the pedal pushed and it will make the engine shutter alittle. this sensor tells the computer what tempature the engine is at and when to idle down or up with the tempature.

Posted on May 30, 2009

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