Hey Everyone,

My car has a weird problem. I have 600cc Deatchwerks Injectors and cylinder 4 says I have a missfire. I have oodles of coils so I tried 3 different ones with the same issue persisting. Also tried the bad coil in question in another cylinder.

So the coil is good. I unplugged the injector as its the middle front one and the issue still persists (5 cylinders firing out of 6 or so it sounds). Now the funny part. If the car idles for a while the injector will kick in and the car drives with no issues.

Does the injector just need a cleaning? I can bring it to be flow tested, cleaned and have the filter changed. Question is why does it run normally after x amount of time.

Any help would be appreciated. Can I leave the injector in brake cleaner overnight or diesel (herd diesel removes gunk fairly well)?

Need advice. Thanks

 

Failed to mention that these injectors have 15000-20000km's on them.

 

Interesting problem for sure considering your injectors only have approximately 12,500 miles on them. Maybe the previous owner lied to you, and they really have a lot more miles on them and need a cleaning? Just guessing here, but what about the wiring/clips right at the injector? Try wiggling the wiring and see if that fixes your problem.

How about calling Deatchwerks and picking their brain? Smart dudes there.

Good luck, and let us know what fixes your problem.

 

They where bought brand new, Injectors are very important. A small correction, they have 13,000km's on them as I haven't put a lot of mileage on my Maxima since owning it. I'm going to pull it out and attach a 12v source to see if it activates properly. This sucks...it couldn't be a simple coil change.

 

Sorry but Deatchwerks injectors are the suck.

 

I can say the same about other companies...

On a side note I sent Deatchwerks an email. Thanks for the suggestion Wizard.

 

And the reason is???

I have Deatchwerks, and have absolutely zero issues.

 

I had a similar issue with a Dw injector before. What I did to test that injector was unplug the injector connector on the cylinder and plug in another spare injector to make sure the wiring is good. You will hear/feel the injector clicking. For me that injector was not firing for some reason either. It also was an inconsistent issue where sometimes it would work and at other times it would stick closed and not fire.

I ended up sending the set of injectors to DW, they tested all of them, found one to be defective, replaced the bad one and sent them back to me.

 

Off topic but, I've been tryin 2 find a set of these but their site doesn't show MAXIMA...where can I get a set from??...thx in adv

 

Just give them a call and tell them you need XXXcc sidefeed injectors for your Max, and they will take care of you.

 

My DW 440cc's have been great. Had them on the car for almost two years now with no issues. Op just give them a call. I'm sure they will take care of you.

 

Ok, well. I did a test today. First I took out the injector and pulsed it with 12v with some brake cleaner in it. The brake cleaner went through the injector. So that worked. Then I decided to swap out the injector with another side, the problem remained in the same cylinder (#4). So the injector is good and the coil is good. This leads me to believe that the o2 sensor is faulty. A couple fo days ago I got a code reader and checked them out. I had a code for bank 1 (I believe the front?) and cylinder 4 misfire.

I never thought anything of the o2 code but now that the injector is confirmed good and same with the coil I'm thinking the o2 is affecting that particular cylinder up until the o2 gets warmed up and is in the proper range.

I'm letting the car cool down for a couple of hours then I'll unplug the o2's and crank the car. If the misfire goes away then its confirmed that the o2 was the issue.

 

If your front o2s are having issues, you will get misfires. Bad o2's can really cause some hell. I have even had the car bog and lean off charts due to bad o2's.

 

Bank 1 is the rear bank on the firewall side. Bank 2 is the front bank on the radiator side. To remember it correctly cylnder 1 is in bank 1 while cylinder 2 is in bank 2.

(firewall)
BANK 1
1 3 5
2 4 6
BANK 2
(radiator)

 

Thx guys,

Here is my update:

Swapped injectors from cylinders 4 to 6 (still have misfire on cylinder 4)
Swapped coils and tried many (still have misfire on cylinder 4)
Swapped spark plug from 4 to 6 (still have misfire on cylinder 4)
Unplugged both o2 sensors (still have misfire on cylinder 4)

Why does it run like crap then run normal....This might be an expensive fix.

 

do a compression test, then let us know how you make out

 

a co-worker of mine had a 2002 tundra v6(im a toyota tech) with a misfire in cylinder 6, would only happen at idle,he tried everything except a compression test, turned out to be a cracked exhaust valve (had 175psi in all the other cylinders except 6 which had 120psi of compression) would run fine driving around,but misfire at idle.....not saying you have a cracked valve but you might have a compression issue.....

 

Yah, I'll do a compression test. I'll burn the car if that's the issue. I lied I won't burn it but damn...

 

well at least VQ's are cheap.....couple hundred bucks.....and not too bad to replace either

 

I would check the voltages being sent to the pigtails of injector 4 and coil 4. Also check the wiring on those pigtails.

 

When I did the 00VI I soldered the connecters in. I'll check the voltage and see if I get anything but to be honest I'm leaning towards the Emanage or ECU as I doubt there is any circuit in between that provides the power. Although I do have a coil boost power supply, but that would affect all the coils not just one.

I'll do a compression test today and start from there.

 

I just replaced my transmission. Honestly don't want to replace a motor. I do have a spare with an upgraded oil pump but the time it would take plus I'm trying to sell the car so yah...

 

http://www.jimwolftechnology.com/wol...CTORSVSNEW.pdf

They do not make their own injectors, they take your stock ones and drill.

 

Thats funny, please stop posting this in the thread. The injector works. I have another issue. Trust me if I saw that in my injector id demand my money back. This is not how the Deatchwerks injectors are built.

It's damn funny when a website puts that up to make there product look superior.

 

Why don't you go ask them how they are built. Ignorance is bliss indeed.

 

your getting off topic, he swapped injectors with an injector that has no issues....we're not here to talk about DW products, start another thread, we're here to help him with a misfire issue, he swapped coils with known good coils,no change, he swapped injectors with another cylinder that had no issues, no change, he also swapped spark plugs, no change....unless there is an issue with his wiring, the problem is deeper than the basics, so unless you want to help with the misfire, i would stay out of it

 

Oh well, good luck with the problem

 

check to make sure you have 12 volts at the injector with the key on, if you have access to an oscilloscope or a noid light, check your injector pulse width. also check for power at your coil connector. but i would do a compression test, its not a bad idea even if you find good compression....

 

Thanks allblackmax96,

I found the problem. It's the emanage. If you slightly bend the board the car runs normal. Otherwise you get a flashing red light. That's what I get for trying to sell her. Anywho, I'm going to bake the board so that the solder remelts and make new contact. Visually I can't see any ic out of place. It's definitely the board though. Couldnt be a simple problem. Never is with my luck.

Update:

Haven't baked the board as the plastic might melt. Going to bring it to work on Monday to have it looked at under the microscope and properly debugged. As of now though she is running properly.

 

glad you figured it out and glad you dont need a motor!!! lol im sure you'll see your connection issue once you take it apart...

 

Should be am happy its not a motor

 

Ok guys found the problem. Its on a 7 channel driver . I took a picture and let it speak for itself. Greddy quality on this board, re soldered and hope all is well. It should be. Enjoy:

 

nice, i knew you'd find it, cheap fixes are always my favorite lol

 

Just wish they didn't happen.