how much power loss????
 

im getting a p1093 code. Recently purchased diablo predator. My question is, How much of a power loss is there, when you have, this "low pressure in the fuel rail during enrichment"? I notice a lil more response with the tuner but its not really noticable. Need help.

when was the last time the fuel filter was changed?

I changed my filter, last week after i purchased the tuner. I checked my diagnostics after i made a few runs with tuner. ( and was kinda disappointed, that i didn't really feel a big difference) anyway, saw i had the code. so i ran it on stock tune ( hard accelerations) and the code came back. I put 85 tune back on and drove a few days of normal driving and code was back. I checked my oil for a diesel fuel smell, and none. I do notice on hard accelerations "tuned or stock" that in 2nd gear it seems to hesitate or kinda platau around 2500 rpm and then pick back up to redline then shift. all other gears rev out normal. I get mid 14 mpg city, and 16 on hwy. all hand calc. (stock)

you should try and get the cp3 tested with a tech II or someone in sanangelo who has efi live, theres tons of guys i know out there who has those tools.

okay i will, thanks 2500 HD. Should i shim the fprv or get a race model. or will getting my cp3 checked tell me if i need to do either?(shim or new pump). Can you pm me some peeps that might help me out with the cp3 check.

since yours is a lb7 buying a shim kit wont help cause it wont work for your engine, or the fprv plug so don't waste ur money, but it can be shimmed though for about 20 cents.

I dont think that is your problem though, getting your cp3 check with a scan tool will tell you more.

:pca1:

you again...

I missed you :cry:

how come shim kit wont work on lb7? or a race fprv? just curious, so i presume it works on lly and lbz. How and Why on those and not lb7? I've seen threads of others doing it so if it doesn't need it why do it.:humm:

It wont work mainly because the shims arnt the right size, second the lb7 dosen have the safe guard programed in the pcm to where when the psi reaches the high then drops it limps, the lb7 dosent trip a limp mode code so unless you dont want your rail psi to drop to 22000 psi then you dont have to modify it, danny modified his he can tell you the size and how to do it.

okay im slowly understanding this stuff. :tu: So back to my original question: How much power loss is there when there is low fuel rail pressure during enrichment (p1093)? I mean, Is my engine putting out 50% power or lower or higher, when the pressure is low?

alot, flow of fuel is cut down drastically when the pressure id lower in the rails, (pressure differential from the fuel in the rail escaping into the cylinder)


And when that code is on, it cuts alot of fuel out of it to bein with.

I just went thru all the power loss stuff and with 2500HD HELP WE FOUND THAT MY CP3 was bad. Do your self a favor and test the pump pressure while driven. Actual pressure should match the desired +\- around 200psi or so. You can read my long thread on the injector regulator and that will give you a good idea of what all it could be and how to check each thing. Good luck but I bet the cp3 is going...:nope: