87 c4 long crank time cold

step one, verify your fuel pressure is at least 39 psi, if not your fuel pressure regulator or pump may be defective,
if the fuel pressure regulators defective swapping to a larger pumps wasted money & time,
and having a factory shop manuals going to be a big help.
if the heat sensor is not working correctly or the ninth injector is plugged the engine takes longer to start

diagnoseing TPI & LT1 problems

the use of a digital volt meter ,too check ALL YOUR FUSES before you start to diagnose problems, having a test fuel pressure gauge and having a shop manual handy that's for your exact corvette or muscle car is almost mandatory YOU'LL NEED TO READ THRU THIS SIMILAR THREAD ALSO...
garage.grumpysperformance.com


I Want Some Suggestions On Potential Problem Sources 1987 Corvette

I've got a 1987 corvette here, in the shop,that had a blown head gasket I repaired, the engines got good compression, and it runs decently when first started and will do so unless its engine is turned off, this is intermittent problem, making it a bit harder to isolate, the engine does not cut...
garage.grumpysperformance.com

C4 and camaro sensor and relay/switch locations and info

this infos bound to be helpful at times READ THE THREAD THRU TO THE END AND BE AWARE IT, AND ALL OTHER THREADS ARE CONSTANTLY UPDATED WITH NEW LINKS AND INFO without testing you simply guessing never guess, deal in verified FACTS! guessing is a waste of time think logically, isolate and test...
garage.grumpysperformance.com

c4 & c5 corvette trouble codes

if your corvette won,t start or run, don,t panic its usually easy to locate the problems source, buy a CHEVY SHOP MANUAL FOR YOUR YEAR CORVETTE! RULE#1 never assume a damn thing ISOLATE ,TEST AND VERIFY...
garage.grumpysperformance.com
The 9th injector is controlled by the cold start switch, which is mounted on the front of the intake manifold under the throttle body. It has a connector that looks like the fuel injector connectors. This switch only operates while cranking. It has a thermal element inside that heats up and opens the switch after 8 seconds or if the coolant temperature is above 95 degrees.

The cold start injector is on the driver's side under the PCV valve tube. In this picture it's the round gray thing. The tube coming out of it goes to the back of the driver's side fuel rail. The connector that goes to the cold start switch is on the rear side.

Cold_Start_injector.JPG


It has no connection to the ECM so it will not set any codes.

The '89 and later compensated for the lack of the cold start injector by richening the mixture during cranking. It was done by changing the firmware.
Click to expand...
 
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