hard start, extended crank
Thread Starter
2nd Gear
Joined: May 2006
Posts: 2
Likes: 0
hard start, extended crank
Hello everyone.
I just wanted to get a pulse check on a 'problem' that a friend and I seem to be experiencing. We both own C4 vettes... one 86 and one 87.
When cold, they both fire to life at the mere touch of the key. Once they warm up however, they both seem to crank for a few seconds before they stumble and fire up.
Both have performance chips (my friend's vette was doing this before the chip). Injectors have been cleaned. They are both tuned with new wires, plugs, cap, rotor. Oil is changed frequently on both. Timing is good. His engine was recently re-newed so that rules out timing chain and mechanical wear.
Does any other C4 owner experience this? Thoughts?
I just wanted to get a pulse check on a 'problem' that a friend and I seem to be experiencing. We both own C4 vettes... one 86 and one 87.
When cold, they both fire to life at the mere touch of the key. Once they warm up however, they both seem to crank for a few seconds before they stumble and fire up.
Both have performance chips (my friend's vette was doing this before the chip). Injectors have been cleaned. They are both tuned with new wires, plugs, cap, rotor. Oil is changed frequently on both. Timing is good. His engine was recently re-newed so that rules out timing chain and mechanical wear.
Does any other C4 owner experience this? Thoughts?
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
If memory serves me, it seems like mine acted that way when the fuel pump was going south. I'd do 2 things first, check the fuel pressure and
second inspect the wires going into the FP relay-you might be surprised what you see there, I was shocked.
second inspect the wires going into the FP relay-you might be surprised what you see there, I was shocked.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Originally Posted by rick lambert
If memory serves me, it seems like mine acted that way when the fuel pump was going south. I'd do 2 things first, check the fuel pressure and
second inspect the wires going into the FP relay-you might be surprised what you see there, I was shocked.
second inspect the wires going into the FP relay-you might be surprised what you see there, I was shocked.
these are the first things that come to mind along with leaky injectors. Check pressure and watch for a sudden drop after shutdown. If fuel pump relay is good it should crank good cold and hot.
Burning Brakes
Joined: Oct 2005
Posts: 798
Likes: 116
From: OAKLEY CA
Originally Posted by Libertyvette
Hello everyone.
I just wanted to get a pulse check on a 'problem' that a friend and I seem to be experiencing. We both own C4 vettes... one 86 and one 87.
When cold, they both fire to life at the mere touch of the key. Once they warm up however, they both seem to crank for a few seconds before they stumble and fire up.
Both have performance chips (my friend's vette was doing this before the chip). Injectors have been cleaned. They are both tuned with new wires, plugs, cap, rotor. Oil is changed frequently on both. Timing is good. His engine was recently re-newed so that rules out timing chain and mechanical wear.
Does any other C4 owner experience this? Thoughts?
I just wanted to get a pulse check on a 'problem' that a friend and I seem to be experiencing. We both own C4 vettes... one 86 and one 87.
When cold, they both fire to life at the mere touch of the key. Once they warm up however, they both seem to crank for a few seconds before they stumble and fire up.
Both have performance chips (my friend's vette was doing this before the chip). Injectors have been cleaned. They are both tuned with new wires, plugs, cap, rotor. Oil is changed frequently on both. Timing is good. His engine was recently re-newed so that rules out timing chain and mechanical wear.
Does any other C4 owner experience this? Thoughts?
Team Owner
Joined: Jan 2003
Posts: 20,305
Likes: 240
From: Summerland B.C. Canada
Originally Posted by Libertyvette
Thanks for the tips! We did discover some leaking injectors!
There seems to be an inherent problem with the factory injectors...are there any recommendations for replacement injectors?
There seems to be an inherent problem with the factory injectors...are there any recommendations for replacement injectors?
Heel & Toe
Joined: Oct 2005
Posts: 20
Likes: 0
Rick
Originally Posted by rick lambert
If memory serves me, it seems like mine acted that way when the fuel pump was going south. I'd do 2 things first, check the fuel pressure and
second inspect the wires going into the FP relay-you might be surprised what you see there, I was shocked.
second inspect the wires going into the FP relay-you might be surprised what you see there, I was shocked.
425-304-4043,
Thanks,
Marc
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
When my car wouldnt idle, turned out to be a leaky PCV hose. Still idled rough so I replaced the IAC cause mine was gummed up really bad and that fixed the problem. Starts right up and idles smoothly.
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Melting Slicks
Joined: Oct 2004
Posts: 2,283
Likes: 0
From: Leeds Alabama
if you are still running stock chips, there is a hot delay built in that cuts off injector flow until oil psi reaches a certain pressure, replacing the chip with one that doesnt have this fixes long start times assuming there are no other problems.
Heel & Toe
Joined: Apr 2006
Posts: 16
Likes: 0
From: Seattle WA.
Originally Posted by AGENT 86
22lb Pink tops from Five O Motorsports. About $250 for the set
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Originally Posted by KramerTamer
My '96 does this EXACT same thing. I was told it's porb. leaking injectors but have yet to verify this. I'm wondering if the above stated replacements would be right for a 96 LT-1? Or are they 24lbs? I'm thinking I want o go this way, just want to be sure of the right parts. Thanks!!
Racer
Joined: Aug 2002
Posts: 386
Likes: 0
From: Lancaster Lancashire
I got my 24's from these guys:-
http://www.blueovalindustries.com/pr...parent=9902061
They gave excellent service at a good price and posted to the UK fast and didn't sting me with postage add ons. They came in a box of 8 just like the picture.
They might do 22's as well you might want to ask em.
Dave
http://www.blueovalindustries.com/pr...parent=9902061
They gave excellent service at a good price and posted to the UK fast and didn't sting me with postage add ons. They came in a box of 8 just like the picture.
They might do 22's as well you might want to ask em.
Dave
Last edited by Davemc1963-87conv; May 30, 2006 at 02:28 PM.
Instructor
Joined: May 2006
Posts: 182
Likes: 1
From: Metairie Louisiana
I just ordered the 22lb pink top flow matched set from
Five O Motorsports, they have a 3 year warranty. My car is 100% stock so I think this was the best product. Hope they turn out to be a nice set.
Five O Motorsports, they have a 3 year warranty. My car is 100% stock so I think this was the best product. Hope they turn out to be a nice set.
Melting Slicks
Joined: Apr 2001
Posts: 2,105
Likes: 220
From: Ca.
Originally Posted by corvette1989bham
if you are still running stock chips, there is a hot delay built in that cuts off injector flow until oil psi reaches a certain pressure, replacing the chip with one that doesnt have this fixes long start times assuming there are no other problems.
