Ok so i got 2 codes awhile ago for knock sensor and cyl. 4 misfire. I changed the coil, 1 week later i get the same codes. wtf? im gettin real tired w/ this b.s., i just had the alternator rebuilt last weekend too. $150 later, alternator is fine, cyl. 4 is still givin me ****. Any ideas other than the coil? car seems to run fine, but i let it warm up outside this morning and i got in the car and the light was on.

 

fuel injector? how does the spark plug look? how does the harness for the coil look?

 

Switch coils one more time. Maybe you have a short in the coil wiring? As 3D said ... check fuel injector and spark plug.

 

ok, spent $75 on a new injector and still didnt fix it. im startin to get a lil pissed off w/ this b.s. any other ideas? i unplug the coil from that cylinder and the car still runs like crap

 

If the spark plug, ignition coil and injector are all replaced; 1.) Make sure the pins on the plug in on the coil are intact. 2.) You may have an open wire before the coil in the harness. You can test the wiring, the procedure is in the FSM.

 

i also just got the code 0201. what should i be lookin at for this? also 0304 showed up. where can i get a fsm?

 

i really need help here guys, im am bustin myself up over this one. 0201 is ever present. im not sure wut to check for this one, i dont know where to go, how can i check my wiring?

 

First off, stop buying parts and throwing it at the car in the hopes it will work. You say the car is running fine under all conditions (ie idle, acceleration etc)? If you have the code but dont actually have a misfire (you would notice it) then everything there should be fine. If you want to be sure, pull out the plug and look for fouling, oil, coolant or anything else. You just changed your alt? Are you sure it is plugged up properly? How is the battery? Voltage spikes/drops can set off CEL for other sensors even if nothing is wrong with them. Have you changed the Knock Sensor yet?

 

no, car runs like ***, its definately running on 5 cylinders. i just dont know why. the codes were 0201 and knock sensor code. i havent replaced the knock sensor. Wouldnt this affect all the cylinders and not just one? im thinking it has to be a broken wire for cyl. 4. I was gonna run a compression test on it just for the hell of it. i can unplug the coil and the engine runs the exact same, but when i took the plug out it seemed like it had spark, wtf.

 

a bad knock sensor wont cause a misfire. did you pull out the plug and inspect it? Do you have access to an extra front coil (or someone who has a max that is willing to let you "borrow" a coil for 5 minutes? If so, pull out cyl. 4 (or wherever it is now if you swapped it) and try a different coil pack. also, make sure the plug is clicked all of the way on (you never know).

 

well, i just got a new coil, i switched it w/ another, checked spark, everthing that i can think of. plus i put a new spark plug in just for the hell of it. the main thing is that when i unplug the coil, the car runs the same, but when i pull the coil/plus and check spark, it seems to fire fine.

 

????

you got a new coil and replaced cyl 4? your new coil is the one you switched from another cylinder?

 

well i bought a new coil, and it made no difference, so i switched it w/ another coil on a different cylinder to see if the new coil was bad also, but no change, and it seems like the coil is fine

 

Change your KS

 

is there any way to make SURE that its the ks cuz i really dont feel like throwin away another $65. also, where and what is the condenser, im not talkin about the a/c condenser.

 

The Ks is a pain in the ***. It throws the ghost code, 0304 and it will NOT trip the CEL. If your car is lagging a lot, and from what you said it sounds like it is, then it is most likely the KS. However, if the car is running rough, I wouldnt be so sure that its the KS. You can read the stickies and find how to figure out if your KS is faulty.

 

knock sensor read .565 mohms. so i think its fine. what is the condenser mentioned about 0201 code? Is this an electronic condenser to absorb extra volts or sometin like that? i wouldnt think its talking about the a/c condenser.

 

If you read the stickies, they do a pretty good writeup on the codes. Here is 0201...

0201
Diagnostic Trouble Code 0201 indicates a problem with the ignition coil and power transistor. The ignition signal from the Engine Control Module is sent to and amplified by the power transistor. The power transistor turns on and off the ignition coil primary circuit. This on-off operation induces the proper high voltage in the coil secondary circuit.

The malfunction is detected when the ignition signal in the primary circuit is not entered during engine cranking or running.

The items to check include
- Harness or connectors (the ignition primary circuit is open or shorted.)
- Power transistor unit built into ignition coil
- Condenser
- Crankshaft Position Sensor (REF)
- Crankshaft Position Sensor (REF) circuit

A misfire on any individual cylinder should set a code, and a problem with the CPS should also set a code.

I would have expected to see DTC 0201 along with one of the following DTCs.
0407 - Crankshaft Position Sensor (REF)
0608 - Cylinder 1 misfire
0607 - Cylinder 2 misfire
0606 - Cylinder 3 misfire
0605 - Cylinder 4 misfire
0604 - Cylinder 5 misfire
0603 - Cylinder 6 misfire

You didn't get one of these "companion" DTCs, and that is puzzling. Maybe one of them will show up in the next few days.

Hopefully this helps...credit to Kevlo911

 

so let me get this right... you pulled out the coil with the engine running and it was producing a spark (consistently) ? you also replaced the fuel injector and spark plug... and it still isn't firing right in that cylinder?

 

From what ive read above, he has. To me from the troubleshooting guide I posted above, it sounds like it is the power transistor unit. However this is built into the coil, so if it is a new coil then the power transistor would be good. The only other thing I can think of is the Crankshaft Position Sensor (REF) or it could also be the condenser.

 

I have to agree with that. If it's getting a spark, and fuel, but it's misfiring, then maybe it is getting the spark at the wrong time. Definately check the crankshaft and camshaft position sensor. That's what I would do next. If that yields nothing, maybe there is something mechanically wrong. Valve problem? Dunno... Not really experience with engine internals (yet... it will happen to me sooner or later )

 

i compression tested it and it seems fine. i have a friend that looked up the code in alldata. so he gave me a whole list of procedures to run through. but i will also check the sensors listed above. ok, so im looking for this post about the grounding kit? i want to try grounding the car a little better, there was maybe a writeup about it? i just cant find it.

 

I am having a problem with the same cylinder. 145,000 miles the coil failed. I took one off another car i have with 155,000 miles......it fixed it. 30 miles later....that one fails....took another off the other engine i have and 40 miles or so same thing. I just put a 3rd off my spare engine.......if this one fails i'll make 1 more attempt with a brand new coil then i'll have to look into the wiring.