88durel

iTrader: (4)

Hey,

So I took my car on its first big trip this weekend. 1600kms round trip, made it down there with no problems. On the way back I got about 1km from my home town and the car began to sputter, A/F gauge ran the entire trip at about 11:1 - 12:1 which I know is rich but its scheduled for the dyno on the 15th of November and I wanted to make sure it could survive more than 50kms of driving.

So about 1km away the A/F gauge jumped to anywhere between 13 - 17 so I had to keep it at about 2400rpm to get 14.7 which meant I was slowly coming to a stop. Everytime I gave it gas over 2400 it would shoot up to around 16:1 and sputter.

I started thinking maybe I am running out of fuel and that's causing reduced fuel pressure and the turbo kicks in and leans me out. Car came to a stop about 5 blocks away from the finish line.

Flooded, took spark plugs out and followed deflooding procedure, started it up and had it running when I took the video. Also noticed that there was gas dripping out of my muffler. Which confuses me how I can be running Lean and have fuel dripping out of my muffler.

The Rev-Backfire situation has happened to me once before. We had the wires from my Microtech x4 to trailing coils mixed up and it did the same thing. Obviously I didn't switch the coils mid trip.

My thoughts are - Can I foul a plug from running 800kms at 11:1 A/F ratio? Did the plug just suddenly foul and that's resulting in the same effect that no trailing had?

- Rotary Facebook Group said Injectors but the injectors have less than 10,000kms on them.

Car will start with a lot of effort but doesn't like to keep running and definitely wont move until I get it figured. My plan is to buy new plugs tomorrow. Any suggestions on what else it could be?

Video -

Molotovman

iTrader: (49)

Replace the plugs, check the coils, check the plug wires. If the issues still persists I'd get to troubleshooting deeper. Did you put together your Microtech harness, did you do a good job of it?

88durel

iTrader: (4)

Had the local RX7 Specialty shop do the microtech install and harness build. I checked the plug for the x4 and microtech just to see and they seem secure.

Plugs were dry White/Light Brown colour when I pulled them but I'll replace anyways.

88durel

iTrader: (4)

Pulled bottom plugs and turned over to see how compression is. Appears to be fine which is good news.
Next step plugs and wires then send injectors away? I didn't think it was possible to foul a plug while driving on the highway but I guess at low air:fuel rations for a long time maybe?

Pulled plugs and they were nice and wet.

lduley

iTrader: (1)

the video where it was rolling over, it may of been the camera, but I only heard 4 good wooshes, not six

The video where your car is running it sounds really weird, but I'm gonna guess thats the gilmer kit your running, cause I know they are noisy.

Being how you flooded out driving, and gas coming out've the exhaust, I would actually start off with compression #'s, not sounds. Also, what do you have for a FPR? Stock? Aftermarket? Known good?

The rev backfire situation, could be because of a dead rotor, or a FPR letting to much fuel go by and heat of exhaust making it fire. Those things are fairly easy to check

88durel

iTrader: (4)

More than likely it's the phone making it sound weird, the wooshes sound more like a chunk chunk on the video. I'll order the electronic compression tester and get an actual reading.

FPR is aftermarket aerometer which is working as far as I can tell. I took a clip of it when the car was running in the first video.

Going to test coils today and have an order made for the compression reader.

lduley

iTrader: (1)

You don't need to spend the big bucks on the digital compression tester, regular one will work fine to give you an idea

88durel

iTrader: (4)

So I didn't have a compression tester, but assuming from the sound that all was well I decided to test the plugs by keeping them connected and watching for spark. No spark. Then I put a volt meter to the +- of the coil and turned the key, no volts. From looking at a simple diagram of the Microtech x4 ignition control it appears that it controls the - , which apparently it has no ground.

The computer is working and providing details on the handset so my thoughts are its the ignition box, but tomorrow I will check the ground to the box to make sure its good.