egr problem maybe?

[coolio2281]

when i go to start my bronco its a 93 5.8, it has a hard time really starting good when i leave it sit over night or for a long while, but if i get it started and drive it a while it starts perfectly fine the rest of the day untill i let it sit over night again? any suggestions to the problem?

 

[Krafty]

Define

it has a hard time really starting good

what exactly is it doing?

 

[coolio2281]

well the idling fluctuates terribly, for about 5 minutes untill its warmed up then its fine...but only happends when its a cold start, but sometimes it will start then die right away, unless i give it gas, but once its warmed up it starts fantasticly

 

[muddrivermike]

Sounds like either a bad IAC or Tps sensor OR vacume leak? :huh:

 

[Seabronc]

What year truck? Carb or EFI?

Please add your truck vital statistics to your signature file. That will aid in getting more accurate answers /emoticons/[email protected] 2x" width="20" height="20" />

Good luck,

>-

 

[coolio2281]

on my first post i put 1993 bronco 5.8...which would be fuel injected...tps sensor is fine i just replaced it and it is reading good on volts

 

[muddrivermike]

What year truck? Carb or EFI?
Please add your truck vital statistics to your signature file. That will aid in getting more accurate answers /emoticons/[email protected] 2x" width="20" height="20" />

Good luck,

>-

Hey Seabronc,Since nobody seems to listen about their truck vitals,Isnt there a way when they join up to make it where they have to enter that info in to start a profile?That way they have no choice,Just wondering.

 

[coolio2281]

ahh get off my ass, iam new here, iam appreciationg each comment someone leaves me, a few have been ver very helpfull...iam just tryin to figure this one out, obviously there wasnt a pop up on your computer saying comment here comment here

 

[muddrivermike]

No this wasnt specificly for you,Theres alot of people on here that we have no idea what truck they are talking about.It just makes it a little easier with a little more info,thats all. :lol:

 

[coolio2281]

true, from now on i will include all vitals

 

[mikes86bronco]

when i go to start my bronco its a 93 5.8, it has a hard time really starting good when i leave it sit over night or for a long while, but if i get it started and drive it a while it starts perfectly fine the rest of the day untill i let it sit over night again? any suggestions to the problem?

have you done a fuel pressure check?

3 test need to be done.

1. koeo test, ck pressure

2. run test:

a. engine running & pressure reg with vac on.

b. engine running & pressure reg vac removed and hose capped.

3. engine off fuel pressure "leak down" test.

a bad regulator could cause "cold start" problems.

the leak down test if it is out of specs would be the main reason for hard "cold" starts as the fuel pressure drops when the pump is off, as the check valve is sticking open, letting the fuel pressue drop to 0 and the pump doesnt build enough pressure for the 1st start.

check fuel regulator 1st, 1 psi out of spec on any of the test, replace it 1st, then redo the leak down test.

you can also try this. turn key on, you hear the pump come on. when it turns off, turn key off then back on. do it 2 or 3 times then start the old girl & see if that helps. if it does, you have either a bad regulator or a bad check valve in the high pressure pump....

been there, done that...

 

[coolio2281]

sweet thanks for the info, i can sacrifce a few extra turn of the keys for my old girl