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Re: 1988 Corvette Hot Start problem
Those 88 tpi engines had an injector bulletin but very few ppl were ever told so i would have fuel system tested but my 88 350 had bad injectors manufactoring defect they would leak too much fuel in into cylinders
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Hi, you do not give a great deal of info about your car, but I will assume that it has done50K miles and is 5 years old.
All combustion engines produce CO2 and Water as part of the Carbon cycle, to produce energy. The same as when you breath out.
When the car is cold ("at start up") this water will show as steam in the exhaust fumes until the exhaust pipe has heated up, the water vapour is then not visible.
Also residual fuel in the exhaust gas will be expelled as the engine usually adds extra fuel to make starting easier at low temperature. On a modern engine the air intake has a heater to preheat the air to assist this process. Excess fuel in the exhaust gas may be coloured Black.
Faults in the cylinder head gasket may allow cooling system water to enter the cylinder bore under cooling system pressure after a journey. When the car is restarted from cold this water will be expelled into the exhaust system, and would be visible as white smoke ( steam) in the exhaust gas at start up. If the cooling system is being topped up on a regular basis, with no other leaks evident, this should be suspected, the smell of antifreeze from the cooling system being detected in this exhaust gas would be a further clue.
Never buy a car without seeing it start from cold, running it till hot and checking for the above. It can be 'disguised' by unscrupulous dealers selling a 'trade in' car through the trade. As on some fairly basic cars the cost is well in excess of £1000.00 (Yes) and count yourself lucky at that. Many other faults can cause smoke at start up, usually engine needs a major service . rebuild.
tune it up. (fresh spark parts work best in cold and for sure damp wheather.
isc stuck closed, and rpm low, hot?
the ecu, anticipates the next cold start,
it knows how much to open the iSC valve, to get a good start cold
and if colder to day, it opens more. (math)
if it (ISC) is gummed up,fas all do, it cant start right
so next time, try %10 throttle, starting, emulating a good ISC.
I have an 87 Comanche and it's the same way. If it ever gets too hot or too cold and won't start, try slipping it to neutral. As far as having a high idle and a long crank time, i'd suggest giving it a tune up and changing out your plugs.
Probably a head gasket. Water / antifreeze seeping into the cyllinder when it's hot/pressured up, and the plug won't fire until the water is blown out the exhaust, then it runs fine. Next time you hot start it, and it's running poorly, see if there is any white smoke coming out the exhaust.
sounds like a dodgy mis reading of a sensor caused by electrical resistance which is turning choke on and flooding engine.know the fault but without car in front of me its difficult to diagnose,could be auto choke sensor which is on right hand side of cylinder head ,but not sure.best is probally dealer have you tried spark plug gaps ??25th although this would cause problems with cold starting not hot starting but its worth a look
well there are a few things that can cause this and Im sure you have tried most but I will run down my normal list first fuel vapor lock is still a problem on high performance cars in the 80s try cycling the key 3 or 4 times from off to on pausing briefly between each cycle to push fuel through the lines if that does work check the location of the fuel line on the front of the block of it is touching there is your problem ok if that doesnt work coil saturation meaning the heat is actually causing it not to fire next would be the the distributor first cap and rotor wires breakdown plugs even do not use platinum or iridium plugs in anything that old even if you think its in great shape one speck of oil it wont fire through it then you have the electronic module in the distributor most chain parts stores can test them for you for free hell most are cheap for the older cars good luck and if you need clarification or more help let me know Danny