help with new start

Bigsexy · Jan 7, 2013

So I had another thread but now have a lot more to add to it. My truck will crank with no start. It all started when I changed the bolts on my battery cables. It started once after that but I shut it off necause it was idilling rough. Ive checked all the fuses and relays along with replacing the batteries. Ive swapped ipr, idm, pcm, alternator and gp relays. The glow plugs relay is getting the correct power. I have had it hooked to a modus and a.e. with everything looking good. We have even tried starting it wih starting fluid and nothing happens. I have plenty of fuel coming out the drain and return. We thought it could have been something with the alarm but its all been disconnected. I need some new ideas to try as ive tried all I can think of and then some. Most of my plugs have signal and voltage. I really need to get it figured out asap as I have bulls I have to get to stock show this weekend

Bigsexy · Jan 7, 2013

The titles suppose to say help with no start.
Ive also swapped cps and buzz tested.

golfer · Jan 7, 2013

what is your ICP reading while cranking?

Bigsexy · Jan 7, 2013

When you just turn the key on it climbs to about 500 then once you start cranking it bumps to 2200. Ive also tried just unplugging the icp and that changes nothing.

golfer · Jan 7, 2013

Bigsexy said:
When you just turn the key on it climbs to about 500 then once you start cranking it bumps to 2200. Ive also tried just unplugging the icp and that changes nothing.

key ON(!?) you have 500psi? (with the ICP sensor plugged in?)

and 2200 cranking?

that doesn't sound right.

key on should be zero...(maybe a few lingering psi depending on time between cranks)...and the psi should ramp up from 100-200-500-and start...

if your scan tool is showing 0,0,0,0,0,0,0,0,0 then 'bing' 2465psi...that is a bogus (default) number.

you might want to put a mechanical (gauge) on there...if I'm interpreting your numbers correctly.

http://swampsdiesel.com/prestashop/en/diagnostic-gauges/912-hpop-test-gauge.html

if/once you DO have verified ICP...any reason to suspect jacked up/bad/low psi fuel?

jdgleason · Jan 7, 2013

Maybe a dumb question but have you pulled your chip and tried to start it?

PSDEng · Jan 7, 2013

Is your IPR plugged in? What are the DC values associated with your ICP numbers?

golfer · Jan 7, 2013

if the chip were a problem....the scan tool (typically) wouldn't have connectivity...@ IPR% are irrelevant to the truck starting...

either it has pressure or it doesn't...I don't think he cares what the DC% is...pressure is pressure...weak pump/strong pump...a psi = a psi.

To the OP-
Another thing...is your scantool reading "pressure" in psi or kPa?

1kpa = 0.145psi
(for example 19,310kPa = 2800 psi)

so "2200" kPa...would only be 319psi which is NOT enough to start a truck...

some scan tools report ICP pressure in kPa...until you change the units in the setup.

Bigsexy · Jan 7, 2013

Sorry key on right after cranking was 300-400 bit it would drop to 500 and come down slowly. As soon as it started cranking thats when it would jump to 2000-2500 range. Ive tried pulling the chip and those numbers are off my biddys a.e.
I have an adrenline pump if that changes anything. Will a truck run at all with a bad hpop?

Bigsexy · Jan 8, 2013

golfer · Jan 8, 2013

Bigsexy said:
Sorry key on right after cranking was 300-400 bit it would drop to 500 and come down slowly. As soon as it started cranking thats when it would jump to 2000-2500 range. Ive tried pulling the chip and those numbers are off my biddys a.e.
I have an adrenline pump if that changes anything. Will a truck run at all with a bad hpop?

if the pump is making pressure (min 500+/- psi) then the pump is good enough to start the engine.

Your first sentence is confusing...but I don't think its pertinent to the issue.

AE will display bogus numbers just like any other scan tool...

but if the pressure seems to steadily increase while cranking..and not just jump right up to 2200 psi...then I would think your ICP readings may be accurate.

Do you have engine RPM ON THE SCAN TOOL while cranking (disregard tach on dash)...?

do you have fuel pressure?

any reason to suspect badddddd fuel?

when you ran the buzz test..did the injectors 'sound' similar in tone/intensity (of the buzz?)?

lincolnlocker · Jan 8, 2013

golfer, shouldn't it still fire with starting fluid? he said nothing happens with that in his op..

live life full throttle

golfer · Jan 8, 2013

I would think it should TRY to hit on ether...

unless the engine has VERY low compression..there should be some kind of combustion occurring..even with every 'computer & wiring harness' removed from the truck...seriously

but..I have seen trucks with good compression not hit on ether...(usually from some seriously jacked up fuel..gasoline, etc..where the AF ratio won't allow for combustion).

Bigsexy · Jan 8, 2013

When we ran the buzz test one sounded a little differant bit wasnt of tone by much. The. Modus showed a rpm but I didnt notice it when I used the a.e.
I didnt look at fuel pressure on either computer, but will when I get it back tommow. I have a fuel pressure gauge but it decided to crap out on me right before this. I did how ever pop the fuel bowl drain and return line and it seemed to have pressure. The bad fuel could be a possibility but ive filled up at that station befor and always run power service with every tank.

Bigsexy · Jan 8, 2013

As for the hpop pressure it jumps as soon as I start cranking to over 2000

Bigsexy · Jan 9, 2013

So I hooked a gauge up to the heads to see what pressure I have at the heads. The truck is right around. 2500 during cranking.

Bigsexy · Jan 13, 2013

So I figured out my problem today. The black check valve in my fuel bowl got stuck in the closed position so I wasnt getting any fuel. After replacing that whole thing shes runs qnd starts like a champ

jdgleason · Jan 13, 2013

Sweet!

Arisley · Jan 14, 2013

Glad it ended up being something easy to fix. I gutted that thing a few years ago. First time I have ever heard of any issues with it sticking closed.