possible fuel delivery problem - need some experts
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On The Tree
Joined: Nov 2002
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From: wichita falls, Tx
possible fuel delivery problem - need some experts Here's what I have:
LT1 383ci forged stroker with eagle rotating assemble, GTP stage II heads, GTP #6 cam, 52mm throttle body, SVO 30lb injectors, hooker LT's, custom Y w/no cats, thru bullet and dumped, MTI tuned.
Here's my problem, a couple of weeks ago on my trip to houston, the car started detonating (knocking) under load and partial to full throttle. Jayson (MTI) had done the tuning on the car so I took it to him and told him my problem and he pulled some timing because he said there was alot in the bottom end with partial throttle. This seemed to help the problem but it knocked on me just a little going back home to wichita falls after the car had gotten good and warm. So yesterday I pull the plugs on the drivers side and find that the #1 and #3 plugs are pinkish on the insulator and the strap that hoods the electrode are white on the back - #5 and #7 are fairly dark but no pinkish discoloration and the electrodes aren't white. Today I pull the passenger side plugs (pain in my A$$) and find the same things #2 and #4 are slightly pinkish and the back two are not.
What could be the cause:
a. tank full of bad gas screwed up the injectors
b. fuel pump not supplying enough fuel to the rail to keep the front four cylinders rich enough
c. I'm a dumbass and this is normal
d. problem with cooling system
e. something else I haven't thought about
Please help with my problem and sorry for the long post.
Michael
LT1 383ci forged stroker with eagle rotating assemble, GTP stage II heads, GTP #6 cam, 52mm throttle body, SVO 30lb injectors, hooker LT's, custom Y w/no cats, thru bullet and dumped, MTI tuned.
Here's my problem, a couple of weeks ago on my trip to houston, the car started detonating (knocking) under load and partial to full throttle. Jayson (MTI) had done the tuning on the car so I took it to him and told him my problem and he pulled some timing because he said there was alot in the bottom end with partial throttle. This seemed to help the problem but it knocked on me just a little going back home to wichita falls after the car had gotten good and warm. So yesterday I pull the plugs on the drivers side and find that the #1 and #3 plugs are pinkish on the insulator and the strap that hoods the electrode are white on the back - #5 and #7 are fairly dark but no pinkish discoloration and the electrodes aren't white. Today I pull the passenger side plugs (pain in my A$$) and find the same things #2 and #4 are slightly pinkish and the back two are not.
What could be the cause:
a. tank full of bad gas screwed up the injectors
b. fuel pump not supplying enough fuel to the rail to keep the front four cylinders rich enough
c. I'm a dumbass and this is normal
d. problem with cooling system
e. something else I haven't thought about
Please help with my problem and sorry for the long post.
Michael
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From: That Southern Fried Space City
Re: possible fuel delivery problem - need some experts Been trying to bite my tongue all day on this one but since no one replied I'll put in my .12 cents. MTI's LT1 tuning hasn't been known to be that great. Your setup is pretty common so I'd look at other mail order tuners to set you up with a program cause thats what the problem sounds like from a distance.
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From: That Southern Fried Space City
Re: possible fuel delivery problem - need some experts By the way, just saw you are from Whichita Falls. Isn't that pretty close to Tulsa? Ed Wrights place isn't that far from you so if you wanted to Dyno Tune you could do it there as well...
Re: possible fuel delivery problem - need some experts b. fuel pump not supplying enough fuel to the rail to keep the front four cylinders rich enough
.
Michael
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From: wichita falls, Tx
Re: possible fuel delivery problem - need some experts thanks guys -I'm beginning to think that the fuel pump may be the culprit and yes I know I'm a dumba$$ for not having it changed but I was having a hard enough time dealing with the shop I was working with. I'm checking the pressure in the rails tonight.
Michael
Michael
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On The Tree
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From: wichita falls, Tx
Re: possible fuel delivery problem - need some experts Hey guys here's the data:
fuel pressure is 40psi with key on. within 20 seconds drops by 2 pounds. Bump the throttle to 2K and it drops by 5psi and the higher you go the lower it gets and doesn't recover. I think my fuel pump is 9 years old and tired.
What to go with?
Aeromotive adjustable reg.
Racetronix LT1 Kit (Walbro GSS 360)
Give me some options - she puts down 415 rwhp now and I'm going to use a power adder in the future.
Michael
fuel pressure is 40psi with key on. within 20 seconds drops by 2 pounds. Bump the throttle to 2K and it drops by 5psi and the higher you go the lower it gets and doesn't recover. I think my fuel pump is 9 years old and tired.
What to go with?
Aeromotive adjustable reg.
Racetronix LT1 Kit (Walbro GSS 360)
Give me some options - she puts down 415 rwhp now and I'm going to use a power adder in the future.
Michael
Re: possible fuel delivery problem - need some experts
Hey guys here's the data:
Give me some options - she puts down 415 rwhp now and I'm going to use a power adder in the future.
Michael
Give me some options - she puts down 415 rwhp now and I'm going to use a power adder in the future.
Michael
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From: That Southern Fried Space City
Re: possible fuel delivery problem - need some experts Wow, didn't figure you still had the same pump.
If you know the pump isn't keeping up then you really shouldn't bother with the "helper" pumps. There are plenty of shops that will install an intank pump for you or you could do it yourself. It's not that bad. The Walbro 255 pumps are pretty cheap and do what you need them to do so if your on a budget that would be my first option.
If you know the pump isn't keeping up then you really shouldn't bother with the "helper" pumps. There are plenty of shops that will install an intank pump for you or you could do it yourself. It's not that bad. The Walbro 255 pumps are pretty cheap and do what you need them to do so if your on a budget that would be my first option.
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On The Tree
Joined: Nov 2002
Posts: 132
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From: wichita falls, Tx
Re: possible fuel delivery problem - need some experts Thanks Big show - I did that very thing this weekend. Cut through the back deck and replaced with a stock unit so that I could get her back on the road. I will be using the aeromotive LT1 package in the future unless anyone has had any experience with them.
I now have a solid 40 lbs with no drop at all and she does run just a bit better top end. Gonna pull the plugs tommorrow just to make sure she's running right.
Michael
I now have a solid 40 lbs with no drop at all and she does run just a bit better top end. Gonna pull the plugs tommorrow just to make sure she's running right.
Michael
