low compression?

kadeninabnitt · Jul 29, 2013

here for the past couple weeks the truck has been a pita to start for the first time of the day. i have to cycle the glow plugs a few times to get it to fire off. outside temps have been in the 70s/80s during the day low 60s at night so i shouldnt have to rely on gp's to start it i wouldnt think. its never been this bad before just changed the oil has a couple hundred miles on it. my thoughts are low compression havent had a chance to check that theory yet. my question is, is there anything else that could go wrong that would exhibit these symptoms.

David N · Jul 29, 2013

Are you batteries good, and strong?

kadeninabnitt · Jul 29, 2013

they seem to be ill run a load test on them in the morn to find out

co04cobra · Jul 29, 2013

If the glow plugs aren't working it won't want to start even at 80*. Check the GP relay and go from there.

kadeninabnitt · Jul 29, 2013

ok will do

golfer · Jul 30, 2013

How many miles are on the fuel injectors?

higher mileage injs will exhibit these exact type of issues.

http://swampsdiesel.com/files/7.3LInjectorDiagnostic.pdf

kadeninabnitt · Jul 30, 2013

230k miles I bought the truck with 190k I dot know if the po had them out or not

kadeninabnitt · Jul 30, 2013

Did a load test on the bats both came back bad so hopefully that's the issue ran a multimeter across the gpr both sides showed a little over 12v so I'm going to try for new batterys and hope that's the cause

Redpower · Jul 31, 2013

I've taken "bad" batterys out of these trucks and ran them in other vehicles for 2-3 years after they were no good in the truck. It takes 2 good, stout batterys to make these trucks start good. If they load test below 11.6V, they never seem to work for me.

AirFishAutomotive · Aug 1, 2013

Redpower said:
I've taken "bad" batterys out of these trucks and ran them in other vehicles for 2-3 years after they were no good in the truck. It takes 2 good, stout batterys to make these trucks start good. If they load test below 11.6V, they never seem to work for me.

I agree, could also have a dead cell , would test gp relay as well. if it test good then go to batteries. All the trucks we sell we put new batteries in just so there are no issues on that end because as mentioned above one bad battery will fubar you

ghohouston · Aug 1, 2013

co04cobra said:
If the glow plugs aren't working it won't want to start even at 80*. Check the GP relay and go from there.

The hell they wont. I went all winter with 7 of my 8 glowplugs not working. I had some hard times starting, but they definitely will start

old man dave · Aug 1, 2013

David N said:
Are you batteries good, and strong?

After you check the batteries then check the starter and cables/connections.

I know a guy who has removed his glow plugs and the truck still starts at less than 40*.

co04cobra · Aug 1, 2013

ghohouston said:
The hell they wont. I went all winter with 7 of my 8 glowplugs not working. I had some hard times starting, but they definitely will start

You were lucky, and your injector o-rings must be in tip top shape. If you have no GPs and fighting any type of o-ring problems they won't want to start in just about any weather if they have sit for any amount of time.

ghohouston · Aug 1, 2013

They were only 6-7 months old, and my starter was weak too. Around february I put a new starter, 2 new batts, a new h.o. alt, and 7 new glow plugs. Once I realized it was probably my gp's, I started plugging it inbefore bed every night, and my god that made a huge difference.

kadeninabnitt · Aug 1, 2013

old man dave said:
After you check the batteries then check the starter and cables/connections.

I know a guy who has removed his glow plugs and the truck still starts at less than 40*.

Load tested the batteries and they both came back bad gonna get new ones and go from there