About to give up

EcSy#2671

EcSy#2671

Si vis pacem, para bellum
'I have been poring time and money into my truck to no solution. I just picked it up from my tech and he is telling me the the chip is wrong. I called Mike at RPM and he guarantees that the chip is correct.

It has no WOT power, anything above 15 psi it goes to about 10.1 AFR.
Pocket dyno told me I was maxing at 196 hp and 14,97 et. It has a good power off the line good boost launch but falls on its face after that.

It also has a shitty cold start up, after start up if goes super lean at idle, untell the vacuum comes down to 17 vac then the AFR comes back up to normal.

I has a all new ignition system, new dist, coil , rotor, cap, wires, plugs. New O2 senser, 3 bar map, mat. New exhaust cut out, 3" from cut out back including a cut and muffler. injectors were flow tested and are good, compression is all good at 150-159 thru all 6, and leak down was good.

I am lost......

any suggestion would be great
 
BoostedSUV

BoostedSUV

Active member
Re: About to give up

Sounds like it could be a fuel volume issue. Have you changed the fuel pump? Does It have an AFPR? What is the fuel pressure set at? How about a fuel pressure gauge that you can watch while the truck is at WOT? 10.1 is super rich, could it be possible you have a kinked or plugged fuel return line that's not allowing fuel back to the tank?


I'm going to ask what everyone is going to ask... Do you have DataMaster so you can log and "see" what the truck is doing?
 
Last edited:
EcSy#2671

EcSy#2671

Si vis pacem, para bellum
Re: About to give up

New 255 fuel and AFPR from RPM and the fuel line are 6 an stainless line feed and return. I do not have a spare ECU and I'd love to try that. No engine codes. I also have a lot of datalog files but no way to upload them.
 
WyoSyclone

WyoSyclone

Active member
Re: About to give up

EcSy#2671 said:
New 255 fuel and AFPR from RPM and the fuel line are 6 an stainless line feed and return. I do not have a spare ECU and I'd love to try that. No engine codes. I also have a lot of datalog files but no way to upload them.
Click to expand...

You can email me the logs and I'd be happy to look at them.. I'm not an expert like the big guys, but I can see obvious things that are causing probs. email to rputman @ bresnan dot net.
 
EcSy#2671

EcSy#2671

Si vis pacem, para bellum
Re: About to give up

WyoSyclone said:
You can email me the logs and I'd be happy to look at them.. I'm not an expert like the big guys, but I can see obvious things that are causing probs. email to rputman @ bresnan dot net.
Click to expand...
done, and thank you for looking at them
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: About to give up

DM will tellyou but I had a similar problem and it turned out the brand new out of the box temp sensor was busted so it was messing with it all.

Not saying that's it but you need to look at the DM file. What injectors are you running? I had a set of 50s from RPM that were flow matched etc but the truck didn't run right with them and a lot of people have had problems with that size.

Like said above, DM is your best bet to diagnose. Don't give up, if you've had the tune up done as thoroughly as it sounds then it's probably a simple fix and you're not far away from getting it done. It'll be a beast.

:tup:

Good luck.
 
bezerk

bezerk

New member
Re: About to give up

i;m loooking at yoiur mod list, and don't see anything on i'njectors? what size do you have in there?
 
EcSy#2671

EcSy#2671

Si vis pacem, para bellum
Re: About to give up

You got me.... I was try to use the stock injectors at 56psi fuel press, Mike from RPM said it should be fine. I was thinking that, If I ran out of injector, the truck would go lean, not rich? If I could prove it is the injector I am ready to try that too.
 
JSM

JSM

Active member
Re: About to give up

I would bet 90% chance a custom tune would solve your issue.
 
cloneman315

cloneman315

Active member
Re: About to give up

Just what I was going to say,strap it on a dyno etc and do a custom tune,end of story,problem solved.
 
Silly

Silly

Banned
Re: About to give up

bezerk said:
untill i read this, i've not seen anybody running stock injectors on a vortec headed engine. i doubt he has a tune for that, maybe your's is for 50's?
Click to expand...

You and me both dude.

Plus i was unaware there is even a good tune out there for 50's.

How did he tune the truck in person or through the mail?
 
bezerk

bezerk

New member
Re: About to give up

Silly said:
You and me both dude.

Plus i was unaware there is even a good tune out there for 50's.

How did he tune the truck in person or through the mail?
Click to expand...

there are alot of 50's tunes out there. was a pretty common size when everybody upgraded
 
WyoSyclone

WyoSyclone

Active member
Re: About to give up

Hey Erik,
Well I just looked at the logs and I don't really see anything that looks bad. You're running an almost steady 16 lbs of boost, 14.7 spark advance, tranny is shifting good, AFR's look a hair lean (11.8). You're picking up just a small amount of KR at the onset of your boost launch and it looks like you're closed loop is holding your AFR's way too lean at that point - but the KR goes away immediately. You're not running out of injector, but you're on the edge with them.

I dont' see any AFR's even close to 10.1....are you getting that # off a separate gauge? Your temps also look good, as does ign voltage and TPS%

Having said all of that it does look like it's running a little slow.... pretty close to my stock Sy.
 
Last edited:
Silly

Silly

Banned
Re: About to give up

bezerk said:
there are alot of 50's tunes out there. was a pretty common size when everybody upgraded
Click to expand...

let me repeat

Plus i was unaware there is even a good tune out there for 50's.

:)

When I asked Joe Lubrant at PTE back when i was doing the 50's he told me flat out no amount of money would pursuade him to do a 50's tune, but if i come back with anything else to let him know lol
 
BoostedSUV

BoostedSUV

Active member
Re: About to give up

Well with all that said, if you're looking for a set of injectors I have set of 50s freshly cleaned and flowed. They have not been on my truck since. They're boxed and ready to go if interested. Not that I'm saying injectors would solve your problem or that you should more money at it, but you should probably be running a larger than stock injector. I know how you feel dude, I've been throwing money at my truck since june and I've yet to figure it out. I even bought new injectors thinking that was problem so that's why I have a set available. :tup:
 
You must log in or register to reply here.
Top