4.3l wont start after swap - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old September 12th, 2012, 05:09 PM   #1
gli_ryan
Member
 
gli_ryan's Avatar
 
Join Date: 09-01-12
Location: Duluth, MN
Posts: 89
iTrader: (0)
Mentioned: 0 Post(s)
Default 4.3l wont start after swap

I picked up a 93 cpi blazer, drove it onto the trailer when I took it home. I swapped the 4.3 into my postal cj. Its all wired up, good to go right? Wrong. I can't get it to start. I've pulled a plug to check for spark, doesn't seem to be sparking or getting fuel. I checked the old key and it isn't one of the resisted ones, I'm using a different key switch anyways.

Fuel pump is priming when key turns to on position. There is power at the ignition coil. I just tried replacing the ignition control module and didn't get any farther in the issue. I'm stuck as to what the problem is.

gli_ryan is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old September 12th, 2012, 05:44 PM   #2
gli_ryan
Member
 
gli_ryan's Avatar
 
Join Date: 09-01-12
Location: Duluth, MN
Posts: 89
iTrader: (0)
Mentioned: 0 Post(s)
Default

got it, wiring was incorrect and ecu was not getting power during cranking. I still haven't gotten it to start though. The motor will turn over, then stop, then turn over more. I am guessing that when its stopping there is a cylinder somewhere thats firing off, can't hear a pop though. Timing likely way off?
gli_ryan is offline   Reply With Quote
Old September 13th, 2012, 08:18 AM   #3
knaffie
Senior Member
 
knaffie's Avatar
 
Join Date: 01-13-08
Location: home is where I hang my hat
Posts: 1,900
iTrader: (11)
Mentioned: 0 Post(s)
Default

Is your fuel pressure in spec?
knaffie is online now   Reply With Quote
Old September 26th, 2012, 03:00 PM   #4
luckeylucas
joe is my bff
 
luckeylucas's Avatar
 
Join Date: 04-29-09
Location: toledo,ohio
Posts: 310
iTrader: (1)
Mentioned: 0 Post(s)
Default

Crank position sensor?
luckeylucas is offline   Reply With Quote
Old September 26th, 2012, 08:44 PM   #5
gli_ryan
Member
 
gli_ryan's Avatar
 
Join Date: 09-01-12
Location: Duluth, MN
Posts: 89
iTrader: (0)
Mentioned: 0 Post(s)
Default

Timing was/is way off.
gli_ryan is offline   Reply With Quote
Old October 13th, 2012, 11:28 AM   #6
gli_ryan
Member
 
gli_ryan's Avatar
 
Join Date: 09-01-12
Location: Duluth, MN
Posts: 89
iTrader: (0)
Mentioned: 0 Post(s)
Default

Bringing this back. Put a couple relatively trouble free miles on this, and a missfire started to show up. It kept getting worse. Also it would never idle on it's own. It would idle for a few seconds at best and then abruptly die. Replaced the idle controller, tps, and the cts. Nothing fixed the issues. Now it wont run at all. Tried all sorts of timing stuff, nothing fixed it. Pulled the intake and all the poppets looked clean, all sprayed, and none stuck open. Checked out the distributor, nothing was broken their either. Put it all back together and it still isn't even trying to fire up. Checked compression, all between 130 and 140, coil is sparking and the one plug I've been able to check so far is also sparking.

I'm at wits end with this thing.

EDIT: running on ford e2000 fuel pump and a new fuel filter. When the missfire started to get worse between shifts the motor would completely die, seemed like a load issue sometimes.

Last edited by gli_ryan; October 13th, 2012 at 11:32 AM.
gli_ryan is offline   Reply With Quote
Old October 13th, 2012, 01:28 PM   #7
wadey
┌∩┐(_)┌∩┐
 
wadey's Avatar
 
Join Date: 03-31-11
Location: White Lake / Mt. Pleasant
Posts: 1,630
iTrader: (7)
Mentioned: 1 Post(s)
Default

did you check the distributor gear for ware? Mine acted like yours when, got worse when it shifted and at idle because when the load went away the gear had extra slop and caused the timing to go all to wack.
wadey is offline   Reply With Quote
Old October 13th, 2012, 03:11 PM   #8
gli_ryan
Member
 
gli_ryan's Avatar
 
Join Date: 09-01-12
Location: Duluth, MN
Posts: 89
iTrader: (0)
Mentioned: 0 Post(s)
Default

Yeah, it seemed like it was minimal in terms of the wear. And the movement didn't seem too much that the rotor would turn. But now it won't even start, at all. It got worse quite quickly. I had just put 5 gallons of gas in it, and there were probably 2 or 3 gallons already in the tank. I'm going to add some more though, my neighbor was on the PD's most wanted list for burglary…potentially a siphoned gas tank? Doubtful as my poppets were spraying plenty of fuel but I'm going to give it another 3 or 4 gallons.
gli_ryan is offline   Reply With Quote
Old October 17th, 2012, 10:48 PM   #9
zook94
Resident Jerkoff
 
zook94's Avatar
 
Join Date: 11-05-05
Location: Saginaw, Michigan, USA, North America, Earth, Milky way
Posts: 1,959
iTrader: (6)
Mentioned: 0 Post(s)
Default

Check the ignition module. It's easy to get at, cheap to replace, and intermittent when failing.
zook94 is offline   Reply With Quote
Old October 20th, 2012, 04:22 PM   #10
gli_ryan
Member
 
gli_ryan's Avatar
 
Join Date: 09-01-12
Location: Duluth, MN
Posts: 89
iTrader: (0)
Mentioned: 0 Post(s)
Default

Turned out to be a combination of cap, rotor, and wires. I've never had any experience of failure of these parts quite like that, nor have I even heard of that before. I checked the cap and rotor before installing the motor, and they looked really good. When I just checked the cap contacts were bad, replaced them and it fired right up. Replaced the plugs/wires because I think the wires may be damaged. It's still missing at idle intermittently though, but will go down the road just fine. I was excited, and wanted to check clearance and what not...

rear is stuffed up all the way, shock is stopping it from going up more. front seems to have another 1" or 2" of up travel.


gli_ryan is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:34 AM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.15972 seconds with 51 queries