Leaky Fuel Injectors
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 26,196
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From: Orlando FL
St. Jude Donor '08-'09
Leaky Fuel Injectors
I am pretty sure I have the L98 Leaky Fuel Injector problem (discussed several months ago on here)... anyway, I've never done anything about it yet. Now I want to get to it and get my car back to 100% running again.
so... how can I tell which one(s) are leaking visually? or is this something I have to do with a pressure gauge or what? I have no doubt theres fuel leaking in to the engine, so I don't need to do the whole fuel pressure test thing.... I was just curious how to tell which one(s) they are.
I'd like to just replace them all, but those things are expensive!!
If anyone has any suggestions, or perhaps a good used set somewhat cheap, please let me know. I am getting my new PCM this weekend which will take care of starting problem #1 with eliminating VATS (that and I have to remove all the VATS computers/chips) and the 2nd problem I had with it leaving me stranded everywhere was the leaky fuel injectors.
Thanks!
so... how can I tell which one(s) are leaking visually? or is this something I have to do with a pressure gauge or what? I have no doubt theres fuel leaking in to the engine, so I don't need to do the whole fuel pressure test thing.... I was just curious how to tell which one(s) they are.
I'd like to just replace them all, but those things are expensive!!
If anyone has any suggestions, or perhaps a good used set somewhat cheap, please let me know. I am getting my new PCM this weekend which will take care of starting problem #1 with eliminating VATS (that and I have to remove all the VATS computers/chips) and the 2nd problem I had with it leaving me stranded everywhere was the leaky fuel injectors.
Thanks!
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
If you rather not use a fuel pressure guage, you can run the engine and turn it off and pull the spark plugs. If they are wet with gas that is the cylinder the injector is leaking in. You might also want to ohm them hot and cold (16 ohm each). I would recommend either servicing all of them or replacing all of them with new. A fuel pressure guage shows how fast the leak is and different approaches can tell you were the leak is actually coming from, but the plugs tell alot.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
Originally Posted by GIJoe
I am pretty sure I have the L98 Leaky Fuel Injector problem (discussed several months ago on here)... anyway, I've never done anything about it yet. Now I want to get to it and get my car back to 100% running again.
so... how can I tell which one(s) are leaking visually? or is this something I have to do with a pressure gauge or what? I have no doubt theres fuel leaking in to the engine, so I don't need to do the whole fuel pressure test thing.... I was just curious how to tell which one(s) they are.
I'd like to just replace them all, but those things are expensive!!
If anyone has any suggestions, or perhaps a good used set somewhat cheap, please let me know. I am getting my new PCM this weekend which will take care of starting problem #1 with eliminating VATS (that and I have to remove all the VATS computers/chips) and the 2nd problem I had with it leaving me stranded everywhere was the leaky fuel injectors.
Thanks!
so... how can I tell which one(s) are leaking visually? or is this something I have to do with a pressure gauge or what? I have no doubt theres fuel leaking in to the engine, so I don't need to do the whole fuel pressure test thing.... I was just curious how to tell which one(s) they are.
I'd like to just replace them all, but those things are expensive!!
If anyone has any suggestions, or perhaps a good used set somewhat cheap, please let me know. I am getting my new PCM this weekend which will take care of starting problem #1 with eliminating VATS (that and I have to remove all the VATS computers/chips) and the 2nd problem I had with it leaving me stranded everywhere was the leaky fuel injectors.
Thanks!
probably for around $100, you can get your originals cleaned and flow tested...
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
I agree with RRTvette
Since you have an L98- this is possible.
Prime your fuel system once or twice, then take out the associated spark plugs. They will be a little damp or show traces of such.
Make sure the plugs are only finger tight so you can get them out quickly after priming.
Since you have an L98- this is possible.
Prime your fuel system once or twice, then take out the associated spark plugs. They will be a little damp or show traces of such.
Make sure the plugs are only finger tight so you can get them out quickly after priming.
Team Owner
Joined: Jan 2003
Posts: 20,324
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From: Summerland B.C. Canada
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
I'm not a fan of the spark plug method, but if any plugs are fuel soaked, I wouldn't run it until it's fixed. Better to pull the rail with the injectors attached and then with a paper towel underneath the injectors, energize the pump. Leave it for awhile and watch for any beads of fuel on the tips of the injectors or fuel on the paper towel.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
with SunCr...checking the plugs is just a hit and miss proposition at best.Ohming them will only tell the health of the injector coils, not necessarily whether they're leaking or not. To absolutely identify which specific injector is leaking (unless your constantly fuel fouling a specific plug) it's best to pull the rail with the injectors and check them.
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 26,196
Likes: 0
From: Orlando FL
St. Jude Donor '08-'09
Thanks a lot for all the help guys, I will give this stuff a try this weekend.
This weekend starts car show month for me. Luckily the one this weekend is 5 mins from my house, so if it gets stuck, I can just let it sit over night and get it the next morning. The next several shows are all out of town, so I was trying to get these issues resolved before then.
Thanks again for the advice. Ill give some of this stuff a try!
This weekend starts car show month for me. Luckily the one this weekend is 5 mins from my house, so if it gets stuck, I can just let it sit over night and get it the next morning. The next several shows are all out of town, so I was trying to get these issues resolved before then.
Thanks again for the advice. Ill give some of this stuff a try!
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Thread Starter
Team Owner
Joined: Jun 2001
Posts: 26,196
Likes: 0
From: Orlando FL
St. Jude Donor '08-'09
BTW: If I wanted to get a new set anyway since that seems to be the best advice to replacing them, I was having a hard time finding what type of injectors to get. There are several different LB ranges (19,20,22,24, etc). how do I tell what I need?
Which brand is the best? I see a lot of people go with the "ford pink tops"
Are these the same ones found here?
http://www.fiveomotorsport.com/Injec...sTPI.asp#caddy
Also, depending what pressure/lbs my stock injectors are, can I get larger ones like 24lb injectors that everyone seems to be getting, and then I assume I will need an adjustable FPR?
On that note, I just had a new PCM burned for all my current mods. that said, should I just replace them with the stock lbs to match the tune or would I need a new tune/pcm burned if I went with larger injectors?
Yes, I did some searching but none of the topics matched my personal questions about this.....
thanks again
Which brand is the best? I see a lot of people go with the "ford pink tops"
Are these the same ones found here?
http://www.fiveomotorsport.com/Injec...sTPI.asp#caddy
Also, depending what pressure/lbs my stock injectors are, can I get larger ones like 24lb injectors that everyone seems to be getting, and then I assume I will need an adjustable FPR?
On that note, I just had a new PCM burned for all my current mods. that said, should I just replace them with the stock lbs to match the tune or would I need a new tune/pcm burned if I went with larger injectors?
Yes, I did some searching but none of the topics matched my personal questions about this.....
thanks again
Burning Brakes
Joined: May 2006
Posts: 857
Likes: 1
From: Morrisonville Illinios
I had a presure gauge on ours and saw the pressure drop almosr as quick as we shut the pump off. Because we had just the headers on found raw fuel dripping out of the drivers side. Had my son pull the plus on that side and #1 was real wet!! Tried the pump with the plugs out and could hear it hissing/leaking out of the plug hole. wro87
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
I agree, if you pull the fuel rail and prime the system this is the best way to tell if the injectors are leaking (visually checking). Checking the plugs and using a fuel pressure guage will help and prevent you from pulling the fuel rail. IMO if *I* were to go through the trouble of pulling the fuel rail, there would be a new set of injectors right beside me.
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by RRT vette
I agree, if you pull the fuel rail and prime the system this is the best way to tell if the injectors are leaking (visually checking). Checking the plugs and using a fuel pressure guage will help and prevent you from pulling the fuel rail. IMO if *I* were to go through the trouble of pulling the fuel rail, there would be a new set of injectors right beside me.
at that point, I would not be putting the same injectors back in... Either new or (my preference) rebuilt.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
You can use the Ford 24# injectors, alot of guys do, but you'll need an AFPR and you probably should have a new chip to change the value..some guys do and some don't, are you still running the air pump?
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 26,196
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From: Orlando FL
St. Jude Donor '08-'09
Originally Posted by rick lambert
You can use the Ford 24# injectors, alot of guys do, but you'll need an AFPR and you probably should have a new chip to change the value..some guys do and some don't, are you still running the air pump?
I really want to get the larger injectors, but if that means burning a new chip and I JUST got a double set burned last weekend for my current setup
