Fuel Pressure

SonomaGTlover

SonomaGTlover

Doghouse Member
Re: Fuel Pressure

TurboTony said:
I haven't read the whole thread, it's late, I'm tired, I'll do that tommorow.

To answer the questions though,

Yes, an exhaust leak anywhere before the sensor is bad, get it welded in properly.

Soldering the wires on the o2 sensor renders it garbage. The sensor "breaths" to get its sample air reference through it's pigtail. Soldering the wires up seals the air path. Extend the harness and buy yourself a new sensor. I'd recommend an AC delco sensor as well. Some of the aftermarket ones cause nothing but trouble.

Tony
Click to expand...
Thanks Tony, it sounds like I broke both rules so that'll be the project for the week. New header collector gaskets and a sensor.
 
SonomaGTlover

SonomaGTlover

Doghouse Member
Fuel Pressure...Problem Solved!!!

Fuel Pressure...Problem Solved!!!

Well, call me stupid or careless but it's not my fault.:oops: I'm blaming GM for my oversight:rant:
It seems that there is a different pattern for the poppet lines that come from the regulator from one side to the other. I guess you could say that I was runing on 4 cylinders and the extra fuel was getting ignited in the exhaust causing my backfire. I had the center and rear poppet nozzles crossed so I was feeding #4 when #6 was firing and feeding #6 when #4 wanted to fire. Why did GM do this? On one side the center line feeds the center cylinder and on the other side it feeds the rear cylinder.:banghead: :screwy: crazy if you ask me.

Anyway, anyone got and estimates on what it'll run now? It ran 16.1 at NATS on the "4 cylinders" so to speak. I hope to get to Gateway (local track) sometime in the next couple weeks. Right now it's time to call Dynosources for a chip unless someone here knows how to deal with my particular ECM.
 
vortecfiero

vortecfiero

New member
Re: Fuel Pressure...Problem Solved!!!

Re: Fuel Pressure...Problem Solved!!!

SonomaGTlover said:
Well, call me stupid or careless but it's not my fault.:oops: I'm blaming GM for my oversight:rant:
It seems that there is a different pattern for the poppet lines that come from the regulator from one side to the other. I guess you could say that I was runing on 4 cylinders and the extra fuel was getting ignited in the exhaust causing my backfire. I had the center and rear poppet nozzles crossed so I was feeding #4 when #6 was firing and feeding #6 when #4 wanted to fire. Why did GM do this? On one side the center line feeds the center cylinder and on the other side it feeds the rear cylinder.:banghead: :screwy: crazy if you ask me.

Anyway, anyone got and estimates on what it'll run now? It ran 16.1 at NATS on the "4 cylinders" so to speak. I hope to get to Gateway (local track) sometime in the next couple weeks. Right now it's time to call Dynosources for a chip unless someone here knows how to deal with my particular ECM.
Click to expand...

its just one big injector firing into a cup with the smaller lines attached and it squirts all the cylinders all the time.. there is no real batch or sequential system built in...
I once forgot to push all the popets all the way down and had a similar problem till i reopened the intake and checked each one...
i could be wrong though....
also each poppet holds back about 40 psi (the system runs considerably higher) and is very small.. any restriction will degrade performance.

craig
 
SonomaGTlover

SonomaGTlover

Doghouse Member
Re: Fuel Pressure

After research I learned that as mentioned above that it realy doesn't matter what order the poppets are in. This puzzles me even more. I don't have any codes and it seemed that all the poppets were in all the way yet when I switched them it was much better. Not just a little, but quite noticeable. They are probably on their way out. Since there is pressure on them all the time is it possible that one or more may dribble a little from a bad seal?

My only other idea would be a sensor that is not reading right or something eventhough no codes. I guess I'll put all of the old sensors back on that originally came off of the intake. There may be a difference from the ones in '92 and '95 eventhough they are both CPI.
 
SonomaGTlover

SonomaGTlover

Doghouse Member
Re: Fuel Pressure

vortecfiero said:
that intake looks awsum btw :tup:
Click to expand...
Thanks, took lots of time and planning to get it right. If nothing works on the truck, it looks good... better than I had pictured actually. I got a lot of the issues ironed out but still missing a bit. I'm gonna play with the timing a bit now and see if I can smooth it out a little.

I'm still looking for someone in the area that can help me tune it:tup:
 
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