Thread: 99 gtp p1629 help

ok guys i cant find my symptoms on here with what my car is doing, forst i bought this car from my friend who is haveing finacal troubles for 600.00 he says it has problems i say no problem, my dad owns a shop and we hooked it up too our scanner and got p1629 theft deterant code, well the car wil run just fine and it drives ok but if you give too much gas it maxs boost out and stutters, but if you just barely push on the pedal it will accerlate just fine and cruise doen the road. but the car will set there and idle just fine for hours. it has 262,000. i know alot of miles so ive been leaning towards the cps, or maybe the theft module itself, thanks guys for your help in advance.

i had also thought of that, but wasnt too sure the owner also chipped it and put a small sc pully on it not sure of size, it wouldnt have anything to do with either or becasue they were done way prior to either of us owning it. also would i have any problems on hollowing cat out besides a ses light?

yeah i understand the "chip deal, also we used a snap on scanner and i watched like the live data and it was pulling a cylinder 3 and 4 misfire on cycles but nothing super high it was onlt like 3 time per cycle on number 3 cylinder and like 12 on the forth cylinder yeah i read on here about that pulley and have seen that, the car will do this regardless of cold or warm so im stumped, that dam theft code came back on alldata we have to being like limp mode dam near, but hey for the money i paid for it ill throw some money at it. yes she's stock

it also had a o2 sensor code in it sensor one bank one, but is there any sensors that could casue this cause im not too sure on how to tell how the cat is bad never had any problems woth one going bad, the ol lady was at the store yesterday and just now told me that she started the car and is acting like it had a cam in it like a lopey flucuation in the idle as the tach show bounceing from a grand and under being erratic idle could this mean a bad crank sensor the car then died and wouldnt start back up for about fifteen minutes. any help guys im stumped.

Originally Posted by Fivefingerdeathpunch

its got alot of miles, so its needs a good tune up.

do plugs, wires, air filter ect ect.

Take the thottle body off and remove the sensors and clean it really well, and then get some maf cleaner and clean the maf off, that may help some.

as for the o2, take the upper o2 sensor out and stick a pressure gauge in the bung and turn the car on, it should read right around 1 psi of back pressure, if its more than its most likely a clogged cat.

ahh ok the plugs and wires were changed not too long ago, maybe a month or two and i will clean the said parts, and i never thought of getting a prssure gauge for the cats thanka lot guys will try and get back with you.

ok guys i havent been on here in awhile buutt, the cat is already hollowed out, so im stumped it threw that dam theft system code maybe the module is bad the code was p1629,still cuts out at high rpm boggs down

you guys got anymore ideas? this problem just started and my firend didnt feel like messing with it and i in herited it lol. so im stumped

car is FIXED the cut out as soon as it got into boost was a clogged cat, the clogged cat can also cause misfire codes, and i also found a broken a vacum line going to the bbv valve, the one that goes to the solonoid hope this helps u guys out and thanks to everyone that help and post i f-ing luv this car spring time new motor and built for performance hehehe, not bad for 500 dollar car.later bros.