24# injectors= Crappy performance?

1988WHTGT · Oct 12, 2005

Ok, so I put 24# injectors in my car along with the C&L calibration tube fro 24#ers. It starts up, idles like crap and runs like crap. It hesitates and pops and just generally acts like crap. Any ideas? All of my mods and stuff are in my sig. Thanx.

Paul Perreca · Oct 12, 2005

no but i'm very interested, just picked up the same injectors and 24 cal tube today, and i have edelbrock heads as well.

1988WHTGT · Oct 12, 2005

Wow, yea you're mods are really close to mine. Have u gotten any times out of it?

D347643 · Oct 12, 2005

heard you cant use a cai ith c and l kits. I myself have a cold air intake but have a lot of pipe before the meter. I actually did an experiment on this on my car before ith the af in ther engine bay. just the air that my mk8 fan was creating would cause the car to surge and whatnot. those c and l units are very sensitive to noise and other air

luckythirteen13 · Oct 12, 2005

i had the same problem when i put in my sc. after i added 8" of pipe in front of the maf it ran perfect

dwhiskie · Oct 12, 2005

Your computer still thinks you got 19#. Have a chip burned to the 24#

1EVIL88VERT · Oct 12, 2005

try clocking the mass air meter to a different position, it worked for me.

jrichker · Oct 12, 2005

Do the simple stuff first...

Clocking the MAF is useful when you have a cold air kit or some other modification to the air box or air inlet before the MAF.

Clocking is turning the MAF housing so that the sensor element is in a different position. It changes the airflow through the MAF to place the sensor pickup in the place where the airflow is the least disturbed.

Look Its Aaron · Oct 12, 2005

dwhiskie said:
Your computer still thinks you got 19#. Have a chip burned to the 24#

Are you sure you got the MAF calibrated for 24lbers?

7upstang · Oct 12, 2005

My C&l ran fine with similar mods. Are you sure they sold you the right sample tube. I would also check to make sure nothing happened to the mass air wires when you transplanted it to the C&L meter. One last thing, Do you know any body that has a Pro-M 24LB that you could swap temporarily to do a test. If the Pro-M fixes the problem, it would at least let you know that it is the meter and not something else. (Ie. injector harness not hooked up properly)

Paul Perreca · Oct 12, 2005

my 24 lb sample tube has blue coloring on one end, is this the right one?? I hope clocking works for mine!! THANKS for making this thread lol

7upstang · Oct 12, 2005

Blue is the right colour if your using the stock A9L computer. I see by your list of Mods that you converted to mass air. If you are using a Cobra computer, I have heard that you need to use a different sample tube due to the fact that the Cobra computer is calibrated for 24 Lb injectors in the first place.

I seriously think you should see if someone has a Pro-m meter so you can try to isolate the problem.

I have both, but by the time the Canadian postal service got my Pro-M down to you, you'd probably be driving a nuclear powered flying car.

nazstang · Oct 12, 2005

1 very obvious thing.... are all the injector clips on tight?? -hey don't laugh, i drove 10 min. like that )

1988WHTGT · Oct 12, 2005

Well, its the blue tube and A9L computer. Is the A9L a cobra computer? I've heard about C&L and cai not working well together, but it ran fine on the 19's. I'll ask around and see if anyone has a ProM. It sucks b/c I don't have the stock air box, wasn't on there when I bought it. Maybe some PCV between the meter and filter, ha

7upstang · Oct 12, 2005

nazstang said:
1 very obvious thing.... are all the injector clips on tight?? -hey don't laugh, i drove 10 min. like that )

Thats why I mentioned the injector harness. I once just about went crazy trying to figure out what the hell was wrong with my car and it turned out the injector harness had come loose and was making intermittent contact. Car ran great/car ran like crap/ can ran great/ car ran like crap etc. Like Nazstang and a bunch of other guys have already said- Check the simple stuff first.

1988WHTGT · Oct 12, 2005

Checked that and its fine. Thanks for all the help guys, some stuff I just don't think of or don't know about. I'll try clocking the maf tomm.

urban96 · Oct 12, 2005

get a pro-m

2002BLGT · Oct 13, 2005

clock it 90 degrees towards the engine and then trim your fuel pressure back to 36 lbs with vacuum off and plugged , that should help tremdously , it did on mine .....check the injector wiring too ...cyl 1 and 2 (front 2 cyl on pass side) the plugs on the injectors can get crossed if you arent careful......also try turning your idle up to about 900-950 rpms ..that should take care of most of it , good luck ........

1988WHTGT · Oct 13, 2005

Well, did all of that....still the same....I dunno

2002BLGT · Oct 13, 2005

whats your timing at ? pull 2 more lbs of fuel pressure out and try it again .....ive checked mine with my wideband and had to take the fuel all the way down to 33 to get a good air fuel ratio out of it , other wise it was like 12.0-11.8 air fuel ....

24# injectors= Crappy performance?

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