obs runs like crap

hayesmsr · Jun 16, 2015

My 97 csb starts and runs good for about 15 miles, then it "hiccups" like a miss then has no power. Doesn't matter what tune I change to they all run like stock. 160 cc injectors are about a year old, stealth srp1.1 hpop, 3" downpipe, wicked wheel2, hydra tuner, new fuel pump, new icp, just rebuilt fuel bowl. Any ideas or suggestions?

Rodslinger · Jun 16, 2015

Valve cover wiring harness to the injectors possibly. My 95 did it a few times. Would kill two injectors on a bank for a while then back on line like it never happened.

ghohouston · Jun 16, 2015

Cps or fuel pressure are the first thoughts. Was the icp sensor ford brand?

hayesmsr · Jun 16, 2015

Fuel pressure is about 65psi, the icp was from international. Haven't swapped the cps because I didn't think those symptoms matched. Uvch connections look good, no burnt spots. I just acts like the injectors are not giving it enough fuel. Almost like it goes into a default or defuel mode jut it's not throwing any codes

Isobaric · Jun 16, 2015

Dump water on the hpop when it starts acting up.
I'll bet you are dropping ICP.

ghohouston · Jun 16, 2015

hayesmsr said:
Fuel pressure is about 65psi, the icp was from international. Haven't swapped the cps because I didn't think those symptoms matched. Uvch connections look good, no burnt spots. I just acts like the injectors are not giving it enough fuel. Almost like it goes into a default or defuel mode jut it's not throwing any codes

Did you check fuel pressure under load? And I've had a cps cause random stalling and violent hiccuping.

hayesmsr · Jun 16, 2015

Fuel pressure was checked under load. Last time I checked hpop pressure it would hold 3100 under a hard load. Never heard of dropping water on the hpop though

Powerstroke Man 6.4 · Jun 16, 2015

hayesmsr said:
Doesn't matter what tune I change to they all run like stock.

Did you ever check on the chip connection on the PCM? did you ever try to take the chip out and see how it runs on the factory PCM tune?

Isobaric · Jun 16, 2015

hayesmsr said:
Fuel pressure was checked under load. Last time I checked hpop pressure it would hold 3100 under a hard load. Never heard of dropping water on the hpop though

It's a spr1.1 thing... Gallon of cold water contracts the housing and allows you to build pressure again.

hayesmsr · Jun 16, 2015

Have not tried removing the hydra. Never heard anything like that about srp1.1

ghohouston · Jun 16, 2015

hayesmsr said:
Have not tried removing the hydra. Never heard anything like that about srp1.1

Guess it shrinks the internals back up. I have heard about it before

Isobaric · Jun 17, 2015

hayesmsr said:
Have not tried removing the hydra. Never heard anything like that about srp1.1

Just give it a shot. Worst case scenario, you are out a gallon of H20.

hayesmsr · Jun 18, 2015

If that works I guess the permanent fix is a new hpop

gnxtc2 · Jun 18, 2015

I'll swap out the CPS to be sure, they are cheap enough.

Billy T.
[email protected]

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lincolnlocker · Jun 19, 2015

ghohouston said:
Did you check fuel pressure under load? And I've had a cps cause random stalling and violent hiccuping.

yuppers! famous for it..

op, are you running a srp hpop?

live life full throttle

Pstrke96 · Jun 19, 2015

My hpop did it after a fuel pump and cps swap. Rykan and I scratched our heads for a while before another new cps to resolve the issue

hayesmsr · Jun 19, 2015

It's the srp1.1 hpop. I have a new cps that I will try when I get a chance. Really hope it's not my hpop, is stealth still in business?

hayesmsr · Jun 20, 2015

Replaced the cps this morning and I think that may have fixed it. It acted up once for a couple of miles but then cleared up. This time I had my torque app going and was able to get some readings. With my foot on the floor the ipr duty cycle was about 33%, hpop was 2400psi, and map wouldn't go above 14lbs. It's like it just won't give it more fuel. Could this be a bad map sensor?

ghohouston · Jun 20, 2015

hayesmsr said:
Replaced the cps this morning and I think that may have fixed it. It acted up once for a couple of miles but then cleared up. This time I had my torque app going and was able to get some readings. With my foot on the floor the ipr duty cycle was about 33%, hpop was 2400psi, and map wouldn't go above 14lbs. It's like it just won't give it more fuel. Could this be a bad map sensor?

You have a high pressure oil leak if your srp1 will only make 2400 psi