on pass side one of my injectors is not getting any ohms because I pull it out and the car still idles the same. I pull the other injector plugs and the car will idle crappy. so I replaced the injector and the coil pack. and the car drives better but it is still misfiring. the way I think I caused this is when I saw the spark plug wire half way on Im sure I drove it like this for a few days aso. but I still dont know whats causing the misfire. I swappedout plugs and still nothin.
whats goin on with the car??
I took my car to the first shop and he didnt know whats wrong took it ti the nex and he said my cpu was locked, would this be whay my car is not throwing a misfire code?? I didnt even know the guy had locked it

Adam

 

Yes a crappy tuner who does not know how to tune and keep engine safe instead of correctly doing the tune simply turns off the error code so nobody would ever know when misfires occur and/or they set the misfire counter tables timers so high that the PCM never trips when misfires occur.
If you know who did the tune you should demand they unlock your PCM.

 

so if he un locks it will the code show and tell me wut to exactly fix?
I will call him today

 

Just unlocking the pcm will not enable the codes. He will have to put the table entries for tripping the code back to stock. Then you will see the codes.

 

The common misfire code is a P0300. This is often accompanied by a check engine light. It is very common to get the check engine light...but no actual misfire...when the cam is swapped out for a larger cam. It is easy to change to value in the PCM to keep the check engine light from coming on.

However,
You state that you are getting no code, and I assume no check engine light.

But you have an actual misfire that you can hear and feel.

I noticed you didn't mention that you checked the plugs to see if they are cracked. I also noticed that you did not check your spark plug wires. Both of these things should be the first things you check.

The best thing for you to do to save some time and money...and I have done it before a couple of times..when having a misfire.

Is to first drive down to the dealership or to somebody that has a Tech II. Ask the service manager if he will hook up the Tech II and the both of you go for a ride down the street monitoring each bank on the Tech II. The Tech II will monitor all of the Banks...using a bar graph..and it will show you exactly what bank is misfiring...believe me this will save you a lot of head aches. In fact the only time I go to the dealership (rare) for any assistance on anything..is for part numbers I can't find...and for their Tech II...in fact they didn't even charge me anything for it.

Tech IIs are $2K+. I have used them twice for two misfiring situations.

First time,
I swapped the headers on my first C5 and I didn't take the plugs out....naturally I bumped one..and then I would get a misfire. Plugged in the the Tech II...5 minutes later I knew which plug was broken, swapped it out, car ran perfectly.

Second time (just recently),
I had a small misfire occurrying that I could not locate, put the Tech II on the car...5 minutes later..had identified Bank 3 as having numerous misfires underload.....took a look and sure enough had a bad plug wire.

I would love to have a Tech II...but so far I have only used one for misfire detection..so for no money or even if it cost me $100, it would be worth it to save me the time to track the misfire down..especially if I was doing crazy stuff like replacing parts that were not broken, or pulling injectors and running the car around.

Use the device that has been developed to identify the problems that you are having...right tool for the job in other words...save youself sometime, frustration, and money.

 

thanks for the advice averybody. the shop recomended I do a compression test.narrowing the problem down the problem seems to be that the injector plug is not sending any energy to the injector itself. I dont know how to fix that. I will drive down to the dealer tomorrow to see if they can hook up the techII cause I'm sick of this.

thanks again and if anybody knows why my injector plug will not be workin right please let me know.

 

well my car decided to throw a code after 3 weeks and it is P0200 H C
anybody know what that is?

 

Possibly a damaged wiring harness IE chaffed wire feeding the injector, open, shorted ect.

If there is an absence of signal to the injector 2 possible reasons are damaged harness / connection issue or the controller (PCM in this case)

pull the fuel rail covers and inspect the harness possibly it's rubbing on the back of the engine somewhere..

Good Luck...
-=Rick

 

well i took the intake manifold off and there is a ground on the drivers side head that was pretty loose I tightened that up but other than that I couldnt find any other loose parts. was that ground a possible reason for the missfire?

 

not real sure is the problem gone?
-=Rick

 

Yep,,those wires are the injector grounds.

BC

 

A P0200 Injector Circuit Malfunction would have caused misfires and at the least the SES should have flashed when misfires occured and if there were multi misfires ( more then 1 cylinder) then it should have tripped a P0300 on the DIC.
Since it did neither I would assume tuner turned off the error code and messed with the misfire tables which leaves you and any tech working on car blind to such problems.
A main ground loose such as you found would cause both misfire and P0200 for that error means a total injector failure and not just one because each injector would have its own code such as P0201 would be for injector 1 and P0200 is a fault for the total injector system and not just one and the PCM hardware drivers controls the injectors ON time not by voltage but by ground.

 

its only that one injector that when I pull the injector plug nothing happens unlike the others where the car will run crappy if I pulled them out.
I did run the car a few days with the spark plug wire half way on which I thought caused the problem, or did it?

well i guess my main question is why do I get the p0200 code if only one Injector is not working Properly?

 

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thanks