Hard starting, rough idle, 3 codes
Thread Starter
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New Member
Joined: Mar 2012
Posts: 2
Hard starting, rough idle, 3 codes
I have a 2000 Blazer 2wd with 4.3l motor.
It takes an excessive amount of cranking to get it to start and once it does, it idles really hard, like its barely able to run. It drives fine and has plenty of power on the road.
I have 3 codes:
PO147
PO300
PO327
So far I've replaced the ignition wires and spark plugs.
Fuel pressure KOEO is 55PSI. When you turn the key on and it immediately jumps to 55PSI and immediately goes back down to 0. KOER is constant 48PSI once it starts.
Help?!
It takes an excessive amount of cranking to get it to start and once it does, it idles really hard, like its barely able to run. It drives fine and has plenty of power on the road.
I have 3 codes:
PO147
PO300
PO327
So far I've replaced the ignition wires and spark plugs.
Fuel pressure KOEO is 55PSI. When you turn the key on and it immediately jumps to 55PSI and immediately goes back down to 0. KOER is constant 48PSI once it starts.
Help?!
BF Veteran
Joined: May 2011
Posts: 2,257
From: SW Central OH
forget the codes for now, neither are causing your driveability problems:
Your problem is with the fuel supply, go here:
https://blazerforum.com/forum/tech-a...agnosis-23038/
Scroll down..
and do the at filter deadend pressure test.
You have to make an adapter with common parts
Alternative roll-dice short cut is Pull oil filler cap , see if you small gas. If so remove upper plenum and then key-on to see leak.
I THINK a plenum leak would not result in a 300, though. most likely a rich condition.
Your problem is with the fuel supply, go here:
https://blazerforum.com/forum/tech-a...agnosis-23038/
Scroll down..
and do the at filter deadend pressure test.
You have to make an adapter with common parts
Alternative roll-dice short cut is Pull oil filler cap , see if you small gas. If so remove upper plenum and then key-on to see leak.
I THINK a plenum leak would not result in a 300, though. most likely a rich condition.
Last edited by pettyfog; Mar 17, 2012 at 05:11 PM.
Thread Starter
|
New Member
Joined: Mar 2012
Posts: 2
forget the codes for now, neither are causing your driveability problems:
Your problem is with the fuel supply, go here:
https://blazerforum.com/forum/tech-a...agnosis-23038/
Scroll down..
and do the at filter deadend pressure test.
You have to make an adapter with common parts
Alternative roll-dice short cut is Pull oil filler cap , see if you small gas. If so remove upper plenum and then key-on to see leak.
I THINK a plenum leak would not result in a 300, though. most likely a rich condition.
Your problem is with the fuel supply, go here:
https://blazerforum.com/forum/tech-a...agnosis-23038/
Scroll down..
and do the at filter deadend pressure test.
You have to make an adapter with common parts
Alternative roll-dice short cut is Pull oil filler cap , see if you small gas. If so remove upper plenum and then key-on to see leak.
I THINK a plenum leak would not result in a 300, though. most likely a rich condition.
BF Veteran
Joined: May 2011
Posts: 2,257
From: SW Central OH
Yeah.. you STILL have to do the FP tests.
302 could be plug wires touching ea other.
BTW... norm idle is 650. 800, warmed, means it's only idling that high to keep running.
302 could be plug wires touching ea other.
BTW... norm idle is 650. 800, warmed, means it's only idling that high to keep running.
Last edited by pettyfog; Mar 18, 2012 at 12:21 PM.
Beginning Member
Joined: Jan 2012
Posts: 36
The hard starting sounds like the fuel pressure regulator to me. If it pops up and then goes right back to zero that check might be shot. Also, the erratic idle could be a vacuum leak. With the engine running, spray the edges of the manifold and throttle body with carb cleaner and see if the engine smooths out. A vac leak can throw a 300 code.
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