Fuel Injectors - the dreaded "hard start when warm"
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
Fuel Injectors - the dreaded "hard start when warm"
I have noticed that I seem to have the good ol' "hard start when warm" condition, that appears, through my reading of the forum, to be the dreaded leaky fuel injectors.
Questions:
1. Are injectors difficult to replace - can I do this myself. My technical / mechanical ability is about a 6 out of 10 and improving the longer I own this car. I do my own oil changes, changed the fuel filter last weekend, removed and cleaned TB and IAC, etc.... I couldn't find a tech tip on this procedure. Does anyone have a documented procdure? I know I know...buy a helms manual....
2. Can I clean / refurbish my existing injectors? or is this a "replacement is the only option" project.
3. I have read posts on whether to stay with 24lb. injectors, Bosch vs. Accel etc. It seems that staying with 24lb. and getting the Ford injectors are the best option. Please tell me if you disagree.
Thanks for your input guys!
Sorry guys...yes, it's a 91 - L98.
Questions:
1. Are injectors difficult to replace - can I do this myself. My technical / mechanical ability is about a 6 out of 10 and improving the longer I own this car. I do my own oil changes, changed the fuel filter last weekend, removed and cleaned TB and IAC, etc.... I couldn't find a tech tip on this procedure. Does anyone have a documented procdure? I know I know...buy a helms manual....
2. Can I clean / refurbish my existing injectors? or is this a "replacement is the only option" project.
3. I have read posts on whether to stay with 24lb. injectors, Bosch vs. Accel etc. It seems that staying with 24lb. and getting the Ford injectors are the best option. Please tell me if you disagree.
Thanks for your input guys!
Sorry guys...yes, it's a 91 - L98.
Last edited by smack123; Jun 15, 2005 at 03:05 PM.
Race Director
Joined: Jul 2001
Posts: 14,604
Likes: 3
From: Glendale, AZ
his profile says 91 - so it's still an L98
shouldn't be too hard to change them even if you were a 3-4 out of 10
i don't think YOU can do anything to clean/service/flush them yourself - but you can have it done - i am in need of the same thing on my LT1 and i am just going to replace all 8 of them it would be easier and save me time i think in the long run.
shouldn't be too hard to change them even if you were a 3-4 out of 10
i don't think YOU can do anything to clean/service/flush them yourself - but you can have it done - i am in need of the same thing on my LT1 and i am just going to replace all 8 of them it would be easier and save me time i think in the long run.
Team Owner
Joined: Mar 2000
Posts: 83,384
Likes: 88
From: Boston, MA
1. You can do it, we have faith in ya.
2. Not yourself, contact Rich at http://www.cruzinperformance.com/
3. If you want NO downtime, buy another set. Otherwise just get yours cleaned up.
2. Not yourself, contact Rich at http://www.cruzinperformance.com/
3. If you want NO downtime, buy another set. Otherwise just get yours cleaned up.
Race Director
Joined: Jun 2004
Posts: 13,969
Likes: 710
From: WI
I was planning to do some testing with mine. Once in awhile she'll crank a long time when hot and start in a way that suggests being flooded. I disconnected the cold start injector but still have the problem. She started fine for a few days but then the long crank happened again. It's random but always when hot. Thinking about it, it seems logical I'd have to disconnect the gas to the CSI instead, to rule out the CSI. The CSI will leak with fuel pressure, not because of the electrical connection, right? Also I traced the wires to a coolant sensor on the front passenger side of the engine, under the TB. Is the other sensor there for the cluster coolant gauge? I know, I'm saving for a Helms!
FYI I saw it posted that sending L98 stock Multec injectors to Cruizin for cleaning was not recomended. Get new ones from five o.
I intend to hook up a fuel pressure gauge and check the pressure. Then check each plug for gas. I read a few days ago about lifting the fuel rail up and being able to see what injector is leaking.
FYI I saw it posted that sending L98 stock Multec injectors to Cruizin for cleaning was not recomended. Get new ones from five o.
I intend to hook up a fuel pressure gauge and check the pressure. Then check each plug for gas. I read a few days ago about lifting the fuel rail up and being able to see what injector is leaking.
Team Owner
Joined: Mar 2000
Posts: 83,384
Likes: 88
From: Boston, MA
Originally Posted by Aardwolf
It's random but always when hot. Thinking about it, it seems logical I'd have to disconnect the gas to the CSI instead, to rule out the CSI. The CSI will leak with fuel pressure, not because of the electrical connection, right?
Is the other sensor there for the cluster coolant gauge?[/quote]
Yes, one of two. That is the one the ECM actually sees while the other one between cylinders 6 & 8 is what displays on your dash.
I know, I'm saving for a Helms!
I read a few days ago about lifting the fuel rail up and being able to see what injector is leaking.
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
Originally Posted by Aardwolf
FYI I saw it posted that sending L98 stock Multec injectors to Cruizin for cleaning was not recomended. Get new ones from five o.
Aardwolf... any idea why it was suggested not to send them to Cruizin for cleaning?
As for down time...the hard start is not so bad that I need to do this now...so I could wait until winter when the car is tucked away in the garage and do it then.
Team Owner
Joined: Mar 2000
Posts: 83,384
Likes: 88
From: Boston, MA
Originally Posted by smack123
Aardwolf... any idea why it was suggested not to send them to Cruizin for cleaning?
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Race Director
Joined: Jun 2004
Posts: 13,969
Likes: 710
From: WI
http://forums.corvetteforum.com/show...ec&forum_id=48
Above is the thread about the Multec cleaning. Cleaning looks worth it if none need replacing. If one or more were bad then it puts the cost right there by the cost of new ones. fiveomotorsport.com has good deals. Maybe if you called Cruizin they would give a good deal on replacing a stock injector. It'd be worth a try if you want to stay with Multec. Does Cruizin sell new injectors? Their webpage is limited.
Scorp, I disconected the sensor on the passenger side of the engine under the TB and no change with starting. So the dash coolant sensor is on the drivers side of the engine by 6 and 8. I figured that one was for the ECM.
Above is the thread about the Multec cleaning. Cleaning looks worth it if none need replacing. If one or more were bad then it puts the cost right there by the cost of new ones. fiveomotorsport.com has good deals. Maybe if you called Cruizin they would give a good deal on replacing a stock injector. It'd be worth a try if you want to stay with Multec. Does Cruizin sell new injectors? Their webpage is limited.
Scorp, I disconected the sensor on the passenger side of the engine under the TB and no change with starting. So the dash coolant sensor is on the drivers side of the engine by 6 and 8. I figured that one was for the ECM.
