Dyno Tuesday, Predictions?

crzyone · Post by **crzyone** » Wed Mar 12, 2008 2:32 am

We unplugges injector clips to see which oned didn't make a difference. The front left cylinders seemed to be dead. There was a definite miss, with the dual exhaust you could tell the front bank wasn't running as well as the rear bank.

More work ahead of me.

Leafy · Post by **Leafy** » Wed Mar 12, 2008 2:59 am

Was a fun day, although it sucks about the results though. At least like you said there's a new base tune to go off of. I wonder though if the BS3 is what is giving all issue, Wideband not working and all. Let me know what you find out.

I have Pictures if Levi doesn't mind that I post them. They turned out pretty well.

befarrer · Post by **befarrer** » Wed Mar 12, 2008 10:20 am

Did it sound like it was running the same way as when we were working on it? It is funny that 2 arent working, and that is the bank you are running your WBO2 off of right? It cant be a wiring issue for the coil pack, but I dont know about the injectors, I never touched those wires, didnt even shorten them. How do the plugs look on those cylinders?

Sorry I couldnt be much help when you phoned me at work about the tach wire, I am pretty sure the ECM feeds the tach signal to the cluster on your car, since there are 2 ignition modules.

The Dark Side of Will · Wed Mar 12, 2008 10:36 am

On a DIS or dizzy setup, there is a single tach signal that carries all ignition signals. That isn't the case with a COP ignition, so either the ECM generates a tach output, or the tach is calibrated for one pulse/revolution.

Leafy · Post by **Leafy** » Wed Mar 12, 2008 1:40 pm

Here are the Pics!

Chris-Nelson · Post by **Chris-Nelson** » Wed Mar 12, 2008 1:55 pm

what color is that?

It looks really cool.

crzyone · Post by **crzyone** » Wed Mar 12, 2008 4:03 pm

Just pulled out my old reciept book and the color is Victory Red, Color #309.

The paint was bought from Earl Scheib Paint and Body in CA.
http://www.earlscheib.com/

My car got really dirty from the truck and trailer. Its amazing how well the camera hides it. It really is a sharp car when its clean. Need to get the front bumber repainted one of these days, its rock chipped pretty bad.

Aaron · Post by **Aaron** » Wed Mar 12, 2008 5:55 pm

The last two are really good pictures! Car looks great, color almost looks maroon, and it's HOT!!!

crzyone · Post by **crzyone** » Wed Mar 12, 2008 7:46 pm

Leafy wrote: I wonder though if the BS3 is what is giving all issue, Wideband not working and all. Let me know what you find out.

I think the wide band is working. The WB is on the front bank, with the 2 dead cylinders. If both cylinders are at WOT and the other 2 are just pushing air than the air fuel ratio would do exactly what it was doing.

The dyno operator could not get better than 14.6:1 on the front bank, but he had the dynos WBO2 on the rear bank exhaust tip. At WOT the dyno was showing around 10-11:1. The front bank would get to 14.6 and stop.

I'm definitly leaning towards the injectors, the wiring or the computer for the problem. Not sure if those cylinders are getting spark but its likely that they are.

Ben, the car sounds like it always has, more lumpy than it should. I just chalked it up to needing a tune badly but now that the engine is "tuned" with 2 dead cylinders its much more apparent that there is a dead spot.

Tomorrow I will spend some time with the car and see if I can't figure it out. Just bought a new multimeter, my last one broke so I can test to see if the injectors are getting a signal. If there is a signal there then it must be the injectors them selves.

crzyone · Post by **crzyone** » Wed Mar 12, 2008 7:53 pm

Leafy · Post by **Leafy** » Wed Mar 12, 2008 7:54 pm

crzyone wrote:

Tomorrow I will spend some time with the car and see if I can't figure it out. Just bought a new multimeter, my last one broke so I can test to see if the injectors are getting a signal. If there is a signal there then it must be the injectors them selves.

Here's to hoping for the easy fix. It does make sense that with the 2 cylinders being dead, the Wideband would only stop at a certain point.

Glad you like the Pictures, if you wanted to come down with the GTR when you get it running we'll do a photoshoot. I love that stuff.

crzyone · Post by **crzyone** » Wed Mar 12, 2008 7:59 pm

That would be cool, the fiero will make my GTR look like a bread box. Not sure how I would get 2 cars in the same place unless it was in Whitecourt.

p8ntman442 · Post by **p8ntman442** » Wed Mar 12, 2008 9:00 pm

there is a topic on the quad4 mailing list right now about bad injectors. Basically on the quad 4, the injector drivers run 2 injectors each. One bad injector can make the driver fail to run both. This could be your case. Do you know how the BS3 drives the injectors? (hardware).

Try leting it idle and disconnect one injector clip at a time. See if rpm PICKS UP. It could if the disconnected injector is the bad one, and the ecm can then fire the other.

Gotta give props to Terry on the Q4 list for this as I had never heard of it b4.

crzyone · Post by **crzyone** » Wed Mar 12, 2008 9:13 pm

Well, good news. The dead cylinders are getting a signal to the injectors. The non working and working cylinders are all getting 6V at idle.

So this narrows it down to an injector or spark issue. I'll pull the front coil pack tomorrow, look at the spark plugs and maybe rig a way for me to check spark. These 1 piece coil pack covers are a bit of a PITA.

The Dark Side of Will · Wed Mar 12, 2008 10:17 pm

Are the injectors firing? Can you tell by putting your finger on one while the engine is running?
If you can't tell that way, then get a stethoscope with a probe and listen to them. You may want to pull the fuel rail off and crank the engine to see what the spray pattern from each injector looks like.

crzyone · Post by **crzyone** » Wed Mar 12, 2008 10:19 pm

Good idea, will be easier to check for fuel than spark. Its a 2 minute job to pull the rail.

If it is the injectors I will run into the city and have them serviced or buy some used ones from a yard. Might be a hard item to find around here.

CincinnatiFiero · Post by **CincinnatiFiero** » Wed Mar 12, 2008 10:24 pm

IMO the tint and the Falken wheels made your car Levi, doesn't look as bad ass when it had the older rims on it.

Shaun41178(2) · Post by **Shaun41178(2)** » Wed Mar 12, 2008 11:02 pm

I would just try to get all new injectors. I mean seriously that motor is how old? And it was sitting in a yard for how long? All of them are probably not at peak performance.

Double check your spark to those cylinders too. I am guessing you have coil on plug right?

crzyone · Post by **crzyone** » Wed Mar 12, 2008 11:37 pm

The motor is an 03 which I bought in 05. Its not that old, but the injectors could be bad anyways. If the 2 injectors are bad I'll take all 8 in to get checked.

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Mar 13, 2008 12:02 am

what size are stock? Might be cheaper to find new ones then have those cleaned.

Those injectors are 5 years old, haven't been run often enough to keep clean. I am thinking they are bad, and the others can't be too great IMO. Even if still good, I am sure the spray patterns aren't the best, and could be killing some hp.