16.0 a/f ratio!! HELP!
Thread Starter
Teching In
Joined: Jan 2004
Posts: 22
Likes: 0
From: Little Rock, AR
16.0 a/f ratio!! HELP! hey guys im needing some help with a fuel problem, heres the deal:
i hav a 00 T/A, and we did a engine swap with an 02 Z28, the motor has a .595/.595 237/242 112, and we swapped the harnesses from the plug in the pass floor board, but we kept the same computers since his hadnt been tuned and i hav hptuner locked to mine, i got the engine from throttle body to k-member, and from what ive been told it should be running extremely rich right now, problem is my long term fuel trims were running like positive 50.0, yea 50 not 5.0, my tune is almost stock other than some throttle cracker/follower and timing and the power enrich table, i hooked up a a/f meter and it was reading 16.0 like immediately, we tested another car the gauge is working correct, ive already had to replace the plugs b/c they were fuel soaked, and ive only put maybe 30 miles on it, i hav the stock 02 injectors and a walbro 255 fuel pump, im just curious if n e body can tell me what the hells goin on with my car!
i appreciate any help u can give me!
thanks,
mike
i hav a 00 T/A, and we did a engine swap with an 02 Z28, the motor has a .595/.595 237/242 112, and we swapped the harnesses from the plug in the pass floor board, but we kept the same computers since his hadnt been tuned and i hav hptuner locked to mine, i got the engine from throttle body to k-member, and from what ive been told it should be running extremely rich right now, problem is my long term fuel trims were running like positive 50.0, yea 50 not 5.0, my tune is almost stock other than some throttle cracker/follower and timing and the power enrich table, i hooked up a a/f meter and it was reading 16.0 like immediately, we tested another car the gauge is working correct, ive already had to replace the plugs b/c they were fuel soaked, and ive only put maybe 30 miles on it, i hav the stock 02 injectors and a walbro 255 fuel pump, im just curious if n e body can tell me what the hells goin on with my car!
i appreciate any help u can give me!
thanks,
mike
FormerVendor
Joined: May 2006
Posts: 187
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I believe the pin locations for the O2 sensors are the same on those two PCMs. Have you verified the fuel pressure? Also, are both banks reading +50? If one is +50 and the other is -50, then you crossed the O2 connections (one side is continuously trying to add fuel but never sees it while the other side is trying to pull fuel but never sees it). Any DTC's?
Thread Starter
Teching In
Joined: Jan 2004
Posts: 22
Likes: 0
From: Little Rock, AR
yea its running 16.0 at idle and all the way through the power band, the o2 sensors were never even unplugged from the headers, i took the headers of his car also, at first the driver side was running like +50.0 and the passenger side was like +10 or so, but after drivin for a while then they both peaked out positive, and my fuel pressure was like 50psi.
Thread Starter
Teching In
Joined: Jan 2004
Posts: 22
Likes: 0
From: Little Rock, AR
on the injectors, i actually just noticed that a lot of fuel tables are different in 00 to 02 so ive been copying the stock 02 tables and see if that helps
bunch of ppl been tellin me that only 98 models have bigger injectors but i thought that 01-02 were a lil bit bigger than 99-00, 01-02's are like 27.8 or somethin right?
bunch of ppl been tellin me that only 98 models have bigger injectors but i thought that 01-02 were a lil bit bigger than 99-00, 01-02's are like 27.8 or somethin right?
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Verdad Gallardo FormerVendor
Joined: May 2006
Posts: 187
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You should confirm fuel pressure, possibly change the fuel filter (not too expensive), etc. i.e. check/verify all things associated with the physical delivery of the fuel.
Does the AFR stay 16:1 at idle after warming up? Does the PCM go into Closed Loop? If so, what is the injector pulsewidth and duty cycle like.
Does the AFR stay 16:1 at idle after warming up? Does the PCM go into Closed Loop? If so, what is the injector pulsewidth and duty cycle like.
Originally Posted by DRTYBRDLS1
i hav a 00 T/A, and we did a engine swap with an 02 Z28, the motor has a .595/.595 237/242 112, and we swapped the harnesses from the plug in the pass floor board, but we kept the same computers since his hadnt been tuned and i hav hptuner locked to mine, i got the engine from throttle body to k-member, and from what ive been told it should be running extremely rich right now, problem is my long term fuel trims were running like positive 50.0, yea 50 not 5.0, my tune is almost stock other than some throttle cracker/follower and timing and the power enrich table, i hooked up a a/f meter and it was reading 16.0 like immediately, we tested another car the gauge is working correct, ive already had to replace the plugs b/c they were fuel soaked, and ive only put maybe 30 miles on it, i hav the stock 02 injectors and a walbro 255 fuel pump, im just curious if n e body can tell me what the hells goin on with my car!
increase the VE table for crank up and NON CL operation so the AFR will come down. check your Injector flow rate table, check you MAF table. increase it. check your OL fueling table(commanded fuel while in OL)... check all those tables, as if you are running that stock tune... and that cam ain't exactly a mild cam....and the car would run lean from it. But i don't see why the car wouldn't go into CL operation and try and maintain a ~14.6AFR.
also, your fuel pressure should be more around 60 or so(if you bought the 255 racetronix PnP kit with wiring harness and hooked it up right).... so when you calculate your IFR table, you may want to take that into effect, I have an excel sheet that can help you out with that table. Check your fuel filter if it hasn't been changed in a while...idk what else to tell ya.
if you were in charlotte, nc I would be at ur house now tryin to help ya... lol
Thread Starter
Teching In
Joined: Jan 2004
Posts: 22
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From: Little Rock, AR
i went with the walbro 255lph fuel pump, and i actually found out about the difference in the fuel tables from 02-00. i also changed the fuel filter at the same time, just my luck i got a bad pump, but it was running the 16.0 a/f and 50+ fuel trim with the stock pump, im hopin the extra volume from the pump will help and i wont know if the fuel tables i changed will fix it until i get a new pump installed tomorrow. thanks for all the help guys and i still appreciate any other idea or suggestions just in case it still doesn fix the problem.
thanks, mike
thanks, mike
