C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1993 Vet running problems

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Old Aug 30, 2012 | 04:39 PM
  #1  
mowerdoctor's Avatar
mowerdoctor
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3rd Gear
 
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From: Kings Park NY
Default 1993 Vet running problems

Can anyone tell me what to look for. Yesterday my car ran great, last night I tried to start it and it stumbled as if it was flowed and running on 7 cylinders, this morning I tried it again, It starts if I hold the gas pedal to the floor than it stalls or to get it to stay running I have to keep pumping the gas pedal. I have not washed or got water on the engine and 700 miles ago the distributer assy was replaced. I have no trouble codes to go by. Oil pressure is good. 70K miles and used like a Sunday driver. 6sp.code P and Y.
Has this happened to anyone.
Thanks ahead of time.
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Old Aug 30, 2012 | 10:35 PM
  #2  
1986coupe's Avatar
1986coupe
Burning Brakes
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From: Niagara Falls ON
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Check fuel pressure. How is your fuel filter? Air filter?

Sometimes on LT1s the coil and/or ICM can cause running issues because of the heat that they are subjected to.
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Old Sep 1, 2012 | 01:59 AM
  #3  
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mowerdoctor
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From: Kings Park NY
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I checked the MAP sensor today, the readings were good, I checked with my Mighty Vac pump. I hooked up my OTC Genisys and started after holding my gas peddle down, the more vacuum I put on the MAP sensor the better it Idled, I went through my reader and noticed that the coolant temp was -23 but my temp gauge in the car was getting hot and the rad fan wasn't going on. I shut the engine off than turned the key back on so my scanned was reading the computer, I jumped out the temp sensor on the front of the engine, the scanner than read 304 degrees, I started up the engine and it ran perfect.
My next step is to replace the computer temp sensor and the MAP to be safe.

Thanks for your suggestions
Chris
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