my old birds been giving me some trouble i recently did a tune up on her cap, rotor, new plugs and wire and after doing that she stumbles when i accelerate not all the time but about halph the time plus my fuel econmy has gone down eny ideas?? thanks

 

are u sure u have the wires on the right plugs>?

 

if it were doing it all the time i would think that the case but intermitently ? i thought if thay were in the rong place it would do it all the time i could be rong, do you know the order thay are supost to be in ???

 

i posted this less than a week ago.

 

find where number 1 is on the dissy cap then put one on and then clockwise its 2 3 4 5 6 the coil is in the middle as obveius and its 1 3 5 on pass side 2 4 6 on drivers side

 

ok well i checked all the wires and thay are in the correct location on the dissy i will drive and see if it is working bette now thanks

 

You could adjust the tps if its a flat spot and I found that helped my old v6 out with that.

 

ok please explane were is the tps at and what do you mean flat spot thanks

 

TPS has a contact surface and after a while it will wear down and loose its accuracy. When you hit the gas the sensor could be hitting the flat spot telling the injectors to run at idle while the throttle is open causing more air and not enough fuel. By adjusting you can get around the flat spot and have some of your acceleration back but this is nothing more than a bandaid and you should replace the TPS if this is the problem.

 

Well from experience I am pretty sure you dont have the wires on wrong. You will DEFINATELY be able to tell that. It wouldn't stumble occasionally. It would run very poorly all the time. My suggestion is to check your gaps on your plugs. That could account for the fuel mileage. Also... What kind of parts did you use? I once bought very good aftermaket lifetime warranty wires with Bosch plugs. The combination was crap. Plus they didn't last very long. I suggest using AC Delco (factory) plugs. Make sure they are gapped properly, then use GM wires. You may have already done this but its just a suggestion. If I read correctly it sounds like the problem didn't occur until after you did the tune up right? Also I remember once I changed plugs on a car with headers. The plugs were hard to get in. As a result, I cracked one of the plugs. Needless to say it ran poorly. Again these are just suggestions. You may already have tried all of them. I hope this is helpful.

 

i always use autolite 104's in my regal, i have gone through 20 sets of plugs since i have owned the car, never ever any problems. i changed my girlfriends tauras' with a brand new set of al104's and her car ran like ****. it took a day to throw a code, is was a misfire on one cylinder. I pulled the plug and it looked fine, no visible cracks in the porcelain. i put another 104 in it and it was fine. just a bad plug. anything can happen.

GL

 

Yeah there used to be a time when Auto Lites were for Ford, Champion was for Chrysler and AC was for GM. You definately can get bad plugs. Even bad wires. My friend has an actual spark plug tester. We tested several brand new plugs and some tested better than others right out of the box.

 

Well which brand plugs would you suggest for a 2.8 camaro. Have Bosch platinum 4's right now but about to replace since they are 3-4 yrs. old and my car is popping like hell.... I wanna know which ones WORK GOOOOOD!!! I'm sure other members would like the info too.

 

keep your gm
vehicle all gm


ac delco

 

rapid fires is what I was thinking myself...

 

Well I have to agree on the AC Delco. I recommend stock wires too. This is just my personal opinion but I think those splitfires are sort of a gimmick. Its not like you are going to make your spark any hotter than the source its coming from. I have had several GM cars and I have tried lots of different types of plugs. I replaced the plugs on a 1992 Cavalier with Bosch platinums. I noticed no difference in performance or gas mileage. And they did not seem to last as long. My recommendation is buy the stock plugs, make sure they are gapped right and try them with a new set of GM wires. I think you will be satisfied with how it runs and how long they last.

As for the popping... That could caused more by the wires. To see if they are jumping fire you can get a spray bottle and fill it with water. When its dark start it and spray it in a mist on your wires all over. If they are cross firing you will see it .

 

As for the popping... That could caused more by the wires. To see if they are jumping fire you can get a spray bottle and fill it with water. When its dark start it and spray it in a mist on your wires all over. If they are cross firing you will see it .[/QUOTE]

Double check tonight for the spark mishaps... Checked last night and found two; on #3 and#4 wires at the boot. Moved heat shields up some and seemed to fix that issue, drove still lacking some power... Today I found out PSI on fuel is 40 at idle.. About to change filter and will check in, thanks again, the car has been down for 2 weeks. At least trying to tie the source down today.

 

How old are the wires? I would replace them.

 

wires/bosch, plugs/ac delco, ICM, cap/rotor, all brand new (rotor does move a little left and right about 1/8 to 1/4" of play) still has some sluggishness to her so I will continue on the search. I'm starting to think now it might b computer related. I do recall taking the ESC off while it was already running to do the timing. I read yesterday to NOT do that, after the fact.. Still has codes flashing properly.

 

Yeah sometimes innaccurate timing will cause sluggishness. How many miles on your engine?

 

about 170k, timing chain is def in need here shortly.

 

well all the plugs i used were ac delco coppers and i checked the gapping on all of them and while i was pulling them all out i did find a crack in the porcilen on my #2 plug changed it and now she is running like a champ thanks guys

 

glad to hear the birds running like a champ! will have to re inspect my plugs too i guess, even new ones can be messed up I've heard. Going to the j/y to go and get a used ecm today to see if that solves my problem. I have no power throughout any rpm range but it won't pop/backfire in the intake till after 2,500 rpms.... slower than a metro for right now. thanks again for everyones help.

 

Do you still have a catalytic converter? I had an oldsmobile that had no power and took the exhaust loose behind the cat and punched some holes in it. Found out that was the problem. You may need a new one. Another wild guess.

 

could possibly be the culprit. it's a fairly new catco cat ~ 4 yrs. old. has seen a few seafoam treatments though.... thinking of calling a buddy whose more inclined than I (ASE) to come over and look at it. tommorows another day of testing though. thinking of running some wires from the 02 inside the car to see if its lean or rich. good tool to have down the road anyways.

Upside...tonight while checking spark on all cylinders.. the wires will arc on the heat shields occasionally, i've seen at the top and bottom of the boot (that shouldn't happen right?!!). will b taking those wires back after seeing that but will take the shields off for now and try minimize it at least. new wires, AC delcos I suppose, will help. These new bosch wires might b crap right out of the box...

 

Yeah I dont think there should be any arcing. I honestly dont know much about the Bosch wires. Maybe there is a warranty on them.

 

they do it's a limited lifetime warranty, on my second pair now. The other ones lasted 3 yrs...

 

They should last 60,000 miles or so. I have had ac delcos last well beyond 60k.

 

good to know. i've fixed the arching by moving close metal objects away from the spark plug wires. I am able to go WOT without any pops at all. It seems the low rpm range is real bad. GOing to double check timing today to make sure the right notch is marked white (I didn't make it but have been using it for years though...) and replace the 02 sensor and check the condition of the cat. spark is nice bright white. fuel pressure is primed to 45 and stays at 40 at idle. given gas it will go up to 42. only thing that worries me is it drops to 20 after a little bit when the car is off. After an hour or two it will drop to 0. Is that a leaking injector? They are fairly new Accels.

 

I honestly don't know much about injectors. I did have the O-rings go bad on my s-10. It ran so much better once I replaced them. I have a friend who is a mechanic. I will ask him and get back. He also owns a Camaro.

 

Thanks alot kevmann, appreciate all the help.