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1986 (Late) Hard Starting When Hot!

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Piratetc

Guest
I have a 1986 Sports Cope (L98 - 5.7 L with TPI) that is getting very hard to start when it is hot. It always has been some what hard to start but, it is getting to the point that I am afraid of accidently burning up the starter or something worst. The last time I drove it the battery almost died before it started. I followed the "Cold or Warm Engine Starting Procedure", then the "If the Engine Fails to Start After Normal Starting Procedure" in the owner's manual and even then it was almost impossible to start. It starts fine when cold and runs great...just hard to start when hot. Help!!!!!! What should I be looking for, I am limited as to having diagnostic tools. I have a Haynes and Chilton repair manual (for C4 vettes 1984 thru 1996)...but they do not go into detail on troubleshooting hard starting when hot.
 
Joined
Jan 15, 2004
Messages
2,240
Location
Northern Indiana
Corvette
1987 Z52 Black Convertible
It could be a clogged catalytic converter, as among any other things. When is the last time you had a tune up? Plugs, wires etc etc something could be failing when its getting hot...
 

Robertwav1

Well-known member
Joined
Jan 7, 2003
Messages
813
Location
Ocala, Florida
Corvette
1993 Blue
I have a 1986 Sports Cope (L98 - 5.7 L with TPI) that is getting very hard to start when it is hot. It always has been some what hard to start but, it is getting to the point that I am afraid of accidently burning up the starter or something worst. The last time I drove it the battery almost died before it started. I followed the "Cold or Warm Engine Starting Procedure", then the "If the Engine Fails to Start After Normal Starting Procedure" in the owner's manual and even then it was almost impossible to start. It starts fine when cold and runs great...just hard to start when hot. Help!!!!!! What should I be looking for, I am limited as to having diagnostic tools. I have a Haynes and Chilton repair manual (for C4 vettes 1984 thru 1996)...but they do not go into detail on troubleshooting hard starting when hot.

The fact that it starts fine when cold is an indication that the engine may be flooding when you shut the car down and it leaks fuel into the cylinders. Cold engine, fuel has had enough time to evaporate and it fires right up. My experience with this either bad fuel injector or bad Fuel Pres Regulator. I would check the regulator first. Good Luck!
 
R

raidoman

Guest
hot start problem

I have 87 that had same problem. The injectors either wear or become dirty and leak down when the engine is shut off causing a flooding condition. I replaced the injectors and the problem was fixed immediately.
I have a 1986 Sports Cope (L98 - 5.7 L with TPI) that is getting very hard to start when it is hot. It always has been some what hard to start but, it is getting to the point that I am afraid of accidently burning up the starter or something worst. The last time I drove it the battery almost died before it started. I followed the "Cold or Warm Engine Starting Procedure", then the "If the Engine Fails to Start After Normal Starting Procedure" in the owner's manual and even then it was almost impossible to start. It starts fine when cold and runs great...just hard to start when hot. Help!!!!!! What should I be looking for, I am limited as to having diagnostic tools. I have a Haynes and Chilton repair manual (for C4 vettes 1984 thru 1996)...but they do not go into detail on troubleshooting hard starting when hot.
 
P

Piratetc

Guest
You got it...my problem was two fold. One - I had six injectors leaking causing the engine to flood when hot, two - the fuel pump was intermintent at times adding to the problem when the engine was hot. Appreciate the information...Thanks!
 

redvett

Well-known member
Joined
Dec 16, 2001
Messages
486
Location
AZ
Corvette
2001 Convertible
I have a 1986 Sports Cope (L98 - 5.7 L with TPI) that is getting very hard to start when it is hot. It always has been some what hard to start but, it is getting to the point that I am afraid of accidently burning up the starter or something worst. The last time I drove it the battery almost died before it started. I followed the "Cold or Warm Engine Starting Procedure", then the "If the Engine Fails to Start After Normal Starting Procedure" in the owner's manual and even then it was almost impossible to start. It starts fine when cold and runs great...just hard to start when hot. Help!!!!!! What should I be looking for, I am limited as to having diagnostic tools. I have a Haynes and Chilton repair manual (for C4 vettes 1984 thru 1996)...but they do not go into detail on troubleshooting hard starting when hot.

If you have the OEM Bosch injectors they are junk. The were notorious for leaking and the fix is the OEM Multeck from GM.
Been there done that.
 

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