WHATS WRONG???

LuisMunoz · Post by **LuisMunoz** » Tue Nov 04, 2008 8:54 pm

after i installed my BBK CAI and 70mm throttle body and plenum my car started to sound like i was dragging cans under it when i would step on the gas pedal lightly and felt really sluggish on accelaration... after installing the predetor tune(U7146) it got louder, i dont know much about cars but that sound it makes doesnt seem right to me, can anybody tell me if there is anything wrong with my car, if so how do i fix it??? If you need more info please let me know!!!!

any input highly appreciated!!!!

thanks

carter242000 · Post by **carter242000** » Tue Nov 04, 2008 10:07 pm

sounds like detonation, dont drive it again until you get it taken care of. my old gt used to do it, cleaning the maf sensor fixed it but could be bad gas or low octane, running lean, etc...BUT DO NOT DRIVE IT.

LuisMunoz · Post by **LuisMunoz** » Tue Nov 04, 2008 10:39 pm

well i run 91 octane from chevron, im not getting any codes for detonation, is there any way for me to know if its runnig lean or not???? its my DD and the only way for me to get around!!!!! how do i fix it and fast, also what kind of damage to the engine are we talking about i mean is it REALLY BAD, i need to fix it as soon as possible so please help

carter242000 · Post by **carter242000** » Tue Nov 04, 2008 10:49 pm

if it sounds like your shaking up a can of marbles then its definately detonation, and that will destroy your motor. you can have detonation without codes...i did. i would return everything to stock and see if its gone, if it is then you were prob. running lean. to check that you would need an air fuel ratio meter or have it put on a dyno. if cleaning the maf sensor and returning it to stock doesnt fix it I would definately have it towed to your mechanic.

carter242000 · Post by **carter242000** » Tue Nov 04, 2008 10:53 pm

also i had issues with my 99 gt when i installed a fenderwell cai, fixed as soon as i changed to a straight shot one.

LuisMunoz · Post by **LuisMunoz** » Tue Nov 04, 2008 11:01 pm

is that on all fender well CAI or just the ones with the MAF sensor after the bend, i was going to switch to a JLT CAI witch has the MAF befor the bend, its acually relocated in the fender well, would this help at all???

BTW thatnks for the replys

carter242000 · Post by **carter242000** » Tue Nov 04, 2008 11:04 pm

yea according to the research ive done, id stay away from any fenderwell ones on our cars. JLT makes a good one from what ive heard. good luck and post back when you figure it out.

LuisMunoz · Post by **LuisMunoz** » Tue Nov 04, 2008 11:10 pm

should i go JLT CAI or JLT ram air intake??? As for the BBK one ill remove it tomorrow asap and put the stock one back, ill also clean the MAF and switch gas maybe even octane... ill invest in a wide band for the mean time to keep in eye on A/F ratio. can you tell me what kond of damage im looking at????

carter242000 · Post by **carter242000** » Tue Nov 04, 2008 11:15 pm

ive never bought a JLT so i wouldnt want to say but as far as damage you should be fine if you dont keep driving it. My first gt did it the day it bought it used. i drove it about 100 miles back to my house, not knowing what it was. I had the car for another 5 years without any issues.

LuisMunoz · Post by **LuisMunoz** » Tue Nov 04, 2008 11:19 pm

any recomandations??? and yeah i bought mine used as well, it had 41K miles and got it for 11,000 couldnt help myself so i bought it

carter242000 · Post by **carter242000** » Tue Nov 04, 2008 11:23 pm

ive always heard good things about JLT and K&N ones. search the forums at allfordmustangs.com and stangnet.com ive learned a ton just by reading the posts that applied to my cars.

LuisMunoz · Post by **LuisMunoz** » Tue Nov 04, 2008 11:27 pm

should i change the plugs as well... i got my GT about 4 months ago and changed the plugs day after i got it, so if its detonation should i replace those as well??

carter242000 · Post by **carter242000** » Tue Nov 04, 2008 11:30 pm

id definately pull at least one and check it for signs of pre ignition...if you have a haynes or chiltons manual theres pics of what you look for

LuisMunoz · Post by **LuisMunoz** » Tue Nov 04, 2008 11:47 pm

ok thanks for the help ill update as soon as fix those things on the car and let you know if it worked or not

BTW thanks for the replys really helped alot!!! first time mustang owner so any more input on what works and what doesnt from who ever would be GREATLY appreciated!!!!

THANKS!!!!

LuisMunoz · Post by **LuisMunoz** » Wed Nov 05, 2008 5:40 pm

ok so heres wat i did... i removed my BBK CAI and reinstalled the factory air box, cleaned the MAF, removed the predetor tune and reinstalled the stock one, my gas tank was on its last drop so i pumped 86 octane into it to see if that might help, after all this NO CHANGE, that F****** sound is still there. i drove around for a while logging a couple of things with the predetor. i noiticed that the DEG SPRKADV would change a lot, when cruising without even touching the gas it would stay at 20 DEG, when i would accel a little it would jump up to 34-36 DEG, one time it went to like 46 or 56 cant quite remeber, i would let go of the gas pedal and it would rapidly drop back down to 20 DEG, and when i would floor it the DEG would drop down to like 10 or 12 DEG, i think the lowest was like 8 or 9... my question is, is this normal for any car??? also forgot to mention that i checked my plugs and they looked pretty bad, i wont be able to replace them until friday (PAY DAY), does this sound like detonation, will replacing the plugs fix my problem or would i have to do something else aswell???

if you need more info let me know

thanks