zrultima

Hi guys i need some help I just traded my LSX jeep to one of our forum members and well its a TSP cammed transam 2001.Well I drove the car home 400 miles and well it drove fine. I started it today and was sitting in traffic when the Service engine light kept blinking and it cut off at a light. I turned the car back on and it started to misfire but still drove i went to park it turn it back on and the check engine light turned off drove it home and drove fine. The car has random misfire code but only when sitting at a light and the idle is very low 500 rpm the guy said he had it tuned when all i think he did was lower the idle with hptuner. Any suggestions guys im sorry for the story let me know

LilJayV10

iTrader: (39)

What cylinder is it? Any codes besides the misfire? It could be any number of things. We need some more information.

zrultima

Its just p0300 random misfire thats all i have but then turns off when restarted

99Bluz28

iTrader: (35)

Check the spark plugs and wires, camshaft position sensor, coil pack connectors.

Xtreme57

iTrader: (6)

Slightly confused -- you traded your Jeep with an LS motor for a cammed TransAm?

Either way, it could be rings on one of the pistons crapping out. Happened to me and my 2001 pretty much as soon as my factory warranty ran out.

zrultima

Sorry was on my phone yes i traded my lsx jeep for a cammed trans am according to the seller of the trans am bottom end was rebuilt 5k. Drove fine for 400 miles so i dont think it would be a piston it suddenly started to missfire at a light but drives fine whole on the highway but now it has the ses light on i will check it at work today to see if anything else comes up

Old Geezer

iTrader: (3)

Maybe try the tune/diagnostics forum??

zrultima

I will definetely go there Old Geezer i will be checking my pcv valve today and make sure there are no cracks and will take a good look at everything but definetely any other suggestion guys

zrultima

Well i checked the codes came out as P1133 p1153 there was one morr but i dont have the scanner with me but will pull it out later

fastassls1maro

iTrader: (22)

p1133 and p1153 are bank 1&2 sensor 1 codes. Its possible though if the car wasnt tuned properly for the cam the engine will throw a p0300 code. Since you say the idle is very low(500rpm) i suspect this is the issue. I have a Torquer V2 cam in my car and my tuner set the idle at around 750-800rpms and it has never thrown a po300 code. I would also check to make sure both the upstream oxygen sensors are plugged in.

zrultima

Alright.guys iys not throwing the p0300 code it cleared itself now the codes thrown are p1133 and p1153 along with p0121 no other codes i driven it 100 miles and thoae are the only codes that appear

1quickirocz

The p0121 is related to a TP sensor fault. The only thing is that if the MAP sensor is reading incorrectly due to a sensor issue or engine performance issue then it can falsly set a p0121 code. The PCM is basically comparing a calculated throttle angle based on other inputs to the actual throttle angle from the TPS. when they dont match the p0121 sets. Now on the other hand the other two codes will not run/set if the p0121 is failed currently. so this tells me that the p1133/1135 failed at a separate time from the p0121. If you have access to an actual scan tool check to see if it stored any misfire history and which cylinder. prob wont show any because you dont even have a p0300 stored in history anymore but its worth a try.

zrultima

Fastassls1maro well no more misfires at all not a single one i do feel when i step on the gas it wont accelerate right away under low rpms. Any other ideas would replacing the oxygen sensor help any there pacesetter long tubes in my old camaro when i had the long tubes i got the same codes but replacing them never help but the car always ran fine

fastassls1maro

iTrader: (22)

well since those codes are for o2 insufficient switching, you almost need a scan tool that you can watch live data on and see if the o2's are switching properly(by this i mean going from lean to rich correctly). If they seem to be working ok those codes could just be triggered by the tune that is on the pcm possibly.

zrultima

Well i would definetely test it out at work if anything i will just have to replace them. Which ones would have to be replace all 4 or just 2 of them. As far as the p0121 code goes would i just have to replace the sensor as see if that works? I hate to throw parts at it but im worried because of what happens during low rpm when accelerating as it just wont accelerate. The best way to describe it is I step on the gas while cruising.for say 20 mph the car thinks about it for a second or two and then slowly accelerates

zrultima

Well as for a test i went ahead and cleared the codes looked at the voltage for the sensor this afternoon and they are switching around but i had it read the codes this evening and the only one that came up again is the p1153. No ther codes came up but the voltage does fluctuate

fastassls1maro

iTrader: (22)

hmm...to be sure its an issues with that sensor try swapping the upstream o2's. If you get that p1153 code there is another issue. If you get the p1133 code i would suspect it has a bad o2 sensor.
like 1quickirocz said.... i wouldnt worry about the TPS sensor code just yet, i believe there is an issue with the o2's causing the TPS code as well.

zrultima

Well i do have long tube pacesetters on the car i thought both p1133 and p1153 were caused because the long tubes didnt heat up enough to cause switching in between the O2 sensors making both codes appear. I can go ahead and buy the upstream O2 sensors any idea what brand i should go with. Its on a budget here so i dont think i can afford ac delcos

zrultima

Guys I have been driving the car for a week now the only codes that keep coming up are p1153 and p1133 the car drives fine for a while then suddenly just losses power for a bit. Any ideas and i did a check on the 02 sensors and they do move around but not like expected but would.the oxygen sensors be causing this issue i really want this resolve hopefully someone has an idea

zrultima

Well guys driving to work today just got off the highway made a right turn onto the street when suddenly my check engine.light starts.flashing and.felt.a.sudden.loss of power it blink for about 10 seconds after those 10 seconds the light went.out.and the power came back all of a sudden. I checked.for.codes again but.the only.ones that came up are p1153 and p1133 nothing else. I am sooo mad i traded my jeep for this thing its pissing me off i cant believe the previous owner was so dishonest about.this