back to old setup. truck still dont run right

[whitelightnin92]

now if i get this right a weak ignition will make the 02 sensor read rich. and will cause you to have to run more spark advance. correct? because the truck really responds well to more timing. ive been advancing and advancing and it keeps taking it. i would say at wot i have somewhere between 38 and 40 degrees of timing and no knocks. idle is probably around 30 degrees. this tells me its ignition. i just cannot figure out what it is!

[whitelightnin92]

found it! pulled my distributor and the gear on it was wore paper thin. i was going to put a new gear on it but found the shaft was bent. so i need a new distributor. im kind scared to put it back together not knowing what the cam gear looks like now

[jim_in_dorris]

If it has a roller cam, did you use a mellonized distributor gear? If not, you need one for a roller cam. Or go all the way to a composite gear. You can find them at summitracing.

[whitelightnin92]

no its a flat tappet comp cam. when i biuld a new motor i will use a roller cam. i should not have bought a cheap distributor from autozone is what it comes down to. the shaft moves almost an 1/8th of an inch side to side when you rotate it. thats ridiculous. it probably costed me a motor since i didnt find it right away

[whitelightnin92]

i took two used distributors and made one good one. this thing runs really good now. it hasnt ran this good in two years. keeps on pulling to over 6k now. im throwing an 02 lean code now that its actually burning some fuel. i need to put a fuel pressure guage back on it cause i turned the pressure down some. also it idles at 0 IAC steps at 1000rpm so i need to close the throttle blades some. crazy how much difference a fricking dizzy gear makes

[oldred95]

i took two used distributors and made one good one. this thing runs really good now. it hasnt ran this good in two years. keeps on pulling to over 6k now. im throwing an 02 lean code now that its actually burning some fuel. i need to put a fuel pressure guage back on it cause i turned the pressure down some. also it idles at 0 IAC steps at 1000rpm so i need to close the throttle blades some. crazy how much difference a fricking dizzy gear makes

Good to hear you are getting it figured out. I've actually got mine pin pointed as well. I ended up putting a large cap computer controlled HEI in it and that along made a world of difference but the underlying cause for the past couple years has been a lack of fuel. Apparently when your injectors go static your wide band reading goes out the window and although it showed to even be rich at times it really was having a fueling issue. I'm at 50 psi on 61# injectors and have cheated on the injector offset vs battery voltage to get a hair more out of the injectors as well as using async at WOT and I'm still breaking up somewhat through 1st and falling on its face going into 2nd and really breaking up bad in second. I've been able to improve it to the point I'm at now from it breaking up to the point it stopped pulling as low as 3500 in 1st gear. Time for 74# injectors. The fat lady has cleared her throat but now its time to make her sing.

[whitelightnin92]

Good to hear you are getting it figured out. I've actually got mine pin pointed as well. I ended up putting a large cap computer controlled HEI in it and that along made a world of difference but the underlying cause for the past couple years has been a lack of fuel. Apparently when your injectors go static your wide band reading goes out the window and although it showed to even be rich at times it really was having a fueling issue. I'm at 50 psi on 61# injectors and have cheated on the injector offset vs battery voltage to get a hair more out of the injectors as well as using async at WOT and I'm still breaking up somewhat through 1st and falling on its face going into 2nd and really breaking up bad in second. I've been able to improve it to the point I'm at now from it breaking up to the point it stopped pulling as low as 3500 in 1st gear. Time for 74# injectors. The fat lady has cleared her throat but now its time to make her sing.

wow thats crazy. thats alot of fuel. i tried the 90lb injectors awhile back and i found they went static at very low PW. i was running them at 18psi. it also made the wideband read rich at WOT even though i was running lean due to static injectors. i ended up pulling the plug on them and putting 61 lb injectors back in. im shure if i played with the tune some(i had a time with injector offsets) i could have gotten it but i didnt think i needed them. i am saving them for my 383 tho. ive decided im going to start collecting parts for it since i have a cam thats on its way out and some blow by aswell. im going to run 10.0:1 compression with the hotcam and a single plane. that little 383 should talk some ****.

one more thing about the wideband ive noticed is it will lie to you. i have better luck with using my ears. i can pretty much hear the difference between lean and rich. i actually took my wideband off the truck because i knew it was wrong. i did like having it for tuning AE . thats about it.

i have one question about your distributor. is it a direct swap or do you have to change a bunch of crap to use it? i wouldnt mind trying one.

[oldred95]

I know its a lot of fuel and I always thought it was enough but I guess not.

The distributor drops right in and the only thing I had to change was the 12 volt ignition and tach connectors. I got those from EFI Connection. I had my almost new MSD super conductors perfectly cut to fit with the old distributor and now with the big cap a few of them are all misplaced and it looks like crap. I see Accel makes a corrected cap now though. I had to change the spark latency table too but I think pretty much everything but a 95 ran the correct table stock for what the big cap HEI uses. I set the entire spark table to 25 degrees and ran it from idle to 5000 rpms and it stayed within 1 degree of 25 so I would say the latency table is pretty accurate.

[whitelightnin92]

thanks. if i ever run into trouble with the stock one putting out i may try a big cap one.

[Koots]

Strange how that stuff just pops up and causes a problem, especially while working on something unrelated.

I had a similar series of problems with my (diesel) truck a while back. I fix one thing, then another would pop up and made it hard to start, fixed that then another came up.

[whitelightnin92]

well, i found alot of oil in my aircleaner base the other day so im pretty shure i have alot of blow by. im going to assume this is why i cant get this thing to idle. it acts like it wants to die at an idle and in gear it keeps hitting the stall saver. it smells and acts really rich, but it shouldnt be. i havnt touched the tune.

[whitelightnin92]

no way in hell im passing inspection in july