Did you bump anything on the board during the dissection?

 

yes I installed the 24lb Bosch Design II injectors from Roger along with the LH Chip from Ken. The car starts much more consistently and jumps right into a smooth steady idle. To be honest I cant say I noticed a huge jump in performance, but I will say I can feel how strong the car is in that 3k-5k rpm range more so now, I always could tell that was the sweet spot but now you can feel that sweet spot in the seat of your pants.

To clarify the starting and idle comment above, prior to the new injectors and LH chip the car would sometimes start normal, other times it would need more crank time, then after it was started it would idle up and down for about 30-45 seconds then smooth out. Currently the car starts with a normal crank of the engine, and jumps right into a smooth idle. The old injectors were not in horrible shape, but the o rings on most were very hard.

I will say when we first fired the car back up from its sleep during our injector, chip, TB_WP, etc work we performed, it idled rough, could feel the car stumbling almost. After a couple starts, installing the air box back on, letting it idle for some extended time it cleaned right up and has been smooth ever since. Not sure why this happened, but similarly to last time when I installed the EZK chip and all new relays and fuses the car ran a little rough for a while then as it ran more it cleaned up and smooths out. I almost think it has to do with each time I disconnect the battery or something.

At any rate, very happy with the outcome. I am only 100-200 miles into this new TB_WP so I have only really pushed her a few short quick occasions. Not sure if there is a break in period for new belts or not, but it will take me some time to get over thinking about the TB while I am standing on the accelerator.

 

You can stomp on it a couple times to see how it is. If you have a Porken tensioner, let it rip!

Jerrybak on a side note, I think our cars may be blood brothers. We have the EXACT colors. My car was built in 10/86 as an early S4 too. Not sure how close your build date is, but that would be something if our cars shared the same line together at some point.

 

how do you know yours is a squirter block #687?

 

928 Registry and the VIN.

 

Well, I have not taken apart the LH myself since it came home from the rebuilder with a clean bill of health and a stock chip, so it can't be a problem internal to the LH I figure. But you have to remove both modules to swap the EZK chip. It is from all this removing and fussing with the harnesses, that has caused the ground wiring to go south.

 

Hi Jerybak. Glad to hear your injector and LH chip upgrade went successfully. I have had the 24# injectors from roger for a while waiting for the nerve to do this. I will likely do it when the weather warms up a bit. Was there a write up on Rennlist that you followed for swapping the injectors?

 

I'm going to call bull****. I'd be willing to bet that doing the chips had nothing to do with any ground problem you are having. If I were to guess, when they put the EZK chip in they didn't do it properly (you have to grind some of the material out to get the boards back in the case) and all your issues relate to that. If they didn't do it properly then the boards are most likely touching the sides of the EZK case or bouncing against its self.

These guys have been doing nothing but guessing on your car since you purchased it, from the Odo gear to this stuff. Hell, these guys aren't even sure you are having a harness issue, they are guessing.

 

Wait a minute, do you have to modify the board to put Ken's chips in? Both LH and EZK?????

 

Not really, injectors were pretty straight forward, I had Dwayne's (hoover over Dwayne's as thats a link) top end refresh write up printed out, and I read it about 5 times prior to work, but we didn't use it. My buddy turning the wrenches is a 928pro IMO so I was fearless...lol.

I was shocked as to how hard you had to push on the fuel rail to get all the injectors to seat properly, also we installed the closed cell foam on the rails, and I know there is much on RL on this topic, but for me it did not quiet the injector noise much at all, as I was hoping for it to do just that.

 

Thanks jerybak. I have read that thread and figured that was the best info.

Mongo, I did not have to modify anything to install the EZK chip. All in all I think it took me less than an hour to do it. And it ran well right away. I know when you open up the LH you have to bend back the metal tabs on the case, but that's all I know of.

 

So way back when I lived in KS, I worked for several years at Raytheon Aircraft in the electrical area, then after moving back to St Louis I got on a kick of building computers and over-clocking them, did this for several years, those years of hands on taught me that static electric can kill electronics.

Not sure if this even matters, but when we installed my chip we made sure to always touch the outside metal case first, and ensured we maintained contact to that metal case during any chip removal/ install work as static electric is dangerous. Might be crazy to mention, but its far to easy of a process to neglect.

 

Nevermind, i'm thinking the STPems. Not kens chips.

Sorry about that.

 

Yes we are all guessing at this point here. The last person to open the EZK was actually me. I thought I put it back together properly. It ran great for a while after that. How would some problem in there cause this rich mixture problem I am having?