This problem has been haunting me for awhile now so thanks for any help! My camaro misses only at idle, it drives perfect through all rpms but idle and the miss in intermittent....what i mean is it will idle fine for a couple sec and then stumble down then run fin a couple more sec. I have replaced ALL sensors like a dummy except the pickup coil and knock sensor, the pickup coil ohm good. I also replaced the ecm, injectors, egr, full tune up and all gaskets in hopes but it still haunts me. I don't have a scanner to see anything and im out of ideas so if you have ANY ideas please post them

 

Have you done a compression check?

 

check spark plug gap / replace spark plugs?

 

changed plugs and made sure gap was set but didn't check compression not looking fwd to pulling plugs again....I did notice when i checked the fuel pressure just a min ago with key on ignition off it only gets to about 35psi and then drops quick! I didnt see any fuel in the pressure regulator vacuum line will do more testing tomarrow. If it was a fuel pump or pressure regulator problem wouldnt it affect the engine more at higher rpm rather that idling with no load?

 

The engine starts fine when cold without any problem. When the engine is warm and start, it will run fine for few seconds then it will stall as if starving of fuel for few seconds or minute then it will recover with its own and runs normally. Another problem occur recently, when the engine is hot and with A/C on, the car has hesitation and if you push the pedal to get more power, it will overheat the engine. Does anyone experience the same symptoms and solve, please share your solution.

 

could be bad regulator, or something is bleeding off fuel pressure

 

but would that cause a dead miss only at idle???

 

yes......

 

well "F".... all that money for something right in front of me, o well live and learn....thx for the info game

 

did you fix it ? I was just giving you a suggestion, not a garantee but I hope it helps you let us know....

 

no have to wait on the car (it's my girlfriends) but there's nothing else it could be unless there is a short in harness or valve train. when i get the car back ill figure out what the prob is fuel pump or regulator, see what happens and ill post back. i did notice that someone has cut a hole to access the fuel pump lol sucks but i aint going to complain if i have to change it haha

 

well changed the fuel pressure regulator and fuel pump now the pressure don't drop but the problem is still there any ideas? also someone is trying to tell me tpi engines won't run right on the brand new autolight plugs i put in and to only use acdelco... it had acdelcos in it to begin with and had the same problem! so does anyone currently use autolight plugs? what was the outcome? anyother ideas about my prob?

 

going to try to check compression tomorrow should i change the plugs again?

 

plllllsssssss let me know how it goes i have the same problem and mine its a new crate engine so i doubt its compression but u never know

 

dont do what i did and start throwing sensors at it lol i got broke real quick haha. has anyone bypassed your antitheft juanillox8... cause mine is and i have been wandering about that being messed up also

 

yes i bypassed it but not with resistors is bypassed with the painless wiring module but i dont think thats the problem bc mine was idling good and all of a sudden began doing that also i don't know about u but sometimes when i put electrical load it stalls (if its stumbling and i turn the light on it dies) and its not the alt bc i tested it and also the battery

AND ITS ONLY ON PARK AND NEUTRAL weird

 

since i have nothing better to do i just tried and it didnt stall when i put all electrical loads i could on.... however it didnt stall when i put it in gear either and earlier today it was so i dont know, its so damn inconsistent.

 

mine stalls only until it warms up actually never mind it dsnt stalls with light it stalls when i turn on the fans since i have a manual switch on them but it only does it in park or neutral, mine sometimes stalls when i shift it but not all the time

 

by any chance did u move any wires on the starter or the battery right before you notice the problem???

 

nope i bought it from some guy in the military and 2 days later it started acting up so he could have but i don't think so.... i have also though the prom might be messed up some how or aftermarket do you have the stock prom? have you had it read or updated sorry don't know much about them

 

ya i have the stock prom and a high performance chip but it does the same thing with or without the chip and i have a obd1 scanner but no codes on the ecm

 

no codes on mine either....i didn't ask u but plz tell me you don't have autolight plugs...guy i know would put his life on it it's my brand new autolight plugs

 

nope i got ac delco

 

have you replaced the egr valve cause i know there is 2 different ones for my car (so the parts people say) and i wander if they gave me the wrong one. what all have u replaced or are u just testing things right now?

 

i tested everything but if it was the egr it would do it even when its in gear not just on idle

 

mine does miss in gear only at idle tho, but sometimes it runs fine "SOMETIMES"!!! Do you remember what your pickup coil ohm at? mine was 750 ohms, not sure if i was supposed to be spinning it or not but i wasn't

 

i put a new one on because my old one wasn't good anymore

weird mine it doest do it at idle in gear only P and N

 

makes no sense to me because whats the difference between park and drive to the engine??? there is more of a load on the engine and i think some of the tranny wires go to the ecm don't they?? man im confused!!!! if you need any trouble shooting tables or anything i have alldata and will pm u what ever u need just let me know

 

yea i don't get it either, yes 2 wires go to ec speed sensor and torque converter wires and two wires from the prk and neutral switch but what it dsnt click is that it was running good and all of a sudden the problem began....

thanx for letting me know ill let u know if i need something tnx

 

any ideas are more than welcome

 

hey have you fix your problem??? i just found out what was wrong on mine..... when u started to throw sensors in by any chance did u replaced ur IAC sensor???? thats what was wrong on mine a co-worker pointed it out on mine as soon as he heard it

 

not yet going to the shop wed. and i have replaced the iac thx for updating tho

 

i have the same problem, assuming you guys are still talking about how it will idle fine, then drop 100 rpm's or so for just a tick, then go back to idling fine. (it was a long thread and i skimmed through it.) i was thinking it may be the IAC. i am going to check it out one of these coming days.

 

lol mine its still doing it im running out of ideas and patience

thedrewdotcom what sparkplugs do u have what did u do to the car before the problem started??? im just trying to see if theres any connections beetween our cars

 

i have some ac delcos. well, i don't know if it did it before. i bought it from a kid this past september, he thought there was a head gasket out because she was blowin some smoke. so i took it in to school, fixed it up, (one head was warped almost to the point of needing to be replaced.) and as long as i have had it it has idled like that.

 

update update????? what happened did u get it fixed???

 

nope... it's been at the shop the last 4 days!!! i called today and it sounds like there having trouble finding the problem also lol. Makes me feel a little bit better!!! will update when it gets back and tell you what they say.

 

yea you're feeling good right now, wait till they give you the bill lol.....
pls let me know, im ruling out everything i can right now before taking it to a shop

 

not sure if mine car and you two have the same prob. mine is a actual miss, it's not hunting (idleing up and down) it's a dead miss but random. either way ill update it might help someone, if not you two then future readers mabey.

 

well got the car back friday and they could not find the problem! damn....replaced the distributor and the miss went away but still have the surging problem, so i bought an aldl cable and going to data log when it gets here. anyone know how to read the logs or what the values should be??? have you fixed your prob yet juanillox8?

 

lol im on the same page i also replaced the dist and nooothing im beginning to think is my ecm cuz i've tried 2 snap-on scanners and they cant connect to the data log... memjr what values do you need i have the shop manual so let me know

 

when the cable comes in im going to data log but i dont know what the values should be never data loged before. so what ever values i need to reference my data. will let u know lol

 

Engine vaccum leaks can cause some werid problems like bad lean misfires and so does over advanced ignition timing.

 

the timing is dead on 6 before and ive capped all vacuum ports except map, fuel, and egr but didn't help. also sprayed carb cleaner while capped and nothing. it does seem to backfire if i rev kinda high then let all the way off...would that be a lean backfire???

 

FINALLY some progress!!!!!! I was messing around with all the cut up wires trying to piece this car back together and while looking at the o2 sensor wire i decided i didn't like the way it was routed so i unhooked it and pulled it around the engine.........the damn engine temp sensor and o2 sensor was laying on the exhaust and burnt through the insulation on both wires. All three was touching! so i made new wires and it runs alot better but still surging a little bit.

 

lol only surges till it warms up and the it runs perfect....what now and by the way do you get a code 12 with a and b pined juanillox8?

 

lol yup only till reaches normal temp hahaha im goint nuts trying to find out whats wrong.....
code 12 is just the test code it basically tell you your aldl is working properly

did u hooked up a scanner or not yet?

 

scanner shipped out today. you said you couldnt scan so no code 12 just popped in my head.... I think i have the wrong egr valve on my car so im putting the old one back on right now and see what that does. started a thread to see if anyone knew which type is supposed to be on my car but know one knows or know one wants to answer

 

hold on let me check the manual, what u wanna know the part number or what exactly? ....in my case the scanner cant connect to the computer to read data log but im able to jump a-b terminals

 

https://www.thirdgen.org/forums/tech...egr-valve.html


I think the brown one is what goes on mine