EEC-IV bronco II
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
Ok, let's sum everything up.
It's an 88 with an 90 ranger engine.
New fuel filter, fuel lines, fuel pressure regulator and plugs.
Fuel pressure is high, 50 psi running.
Good spark, timing at 10' w/o spout, advance is working.
ECU from new engine.
Codes 21, 24, 86 and 89.
The 21 is due to it not being up to temperature. 86 & 89 are due to the swap most likely. The 24 is the ACT which can't be explained.
I would run the pinpoint test for the 24 code, email me if you need it.
What do the plugs look like, do they indicate a rich condition?
I would still want to find out why the feul pressure is high. I'll be working on a tech info link in the next few days.
It's an 88 with an 90 ranger engine.
New fuel filter, fuel lines, fuel pressure regulator and plugs.
Fuel pressure is high, 50 psi running.
Good spark, timing at 10' w/o spout, advance is working.
ECU from new engine.
Codes 21, 24, 86 and 89.
The 21 is due to it not being up to temperature. 86 & 89 are due to the swap most likely. The 24 is the ACT which can't be explained.
I would run the pinpoint test for the 24 code, email me if you need it.
What do the plugs look like, do they indicate a rich condition?
I would still want to find out why the feul pressure is high. I'll be working on a tech info link in the next few days.
Thread Starter
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Junior User
Joined: Mar 2004
Posts: 53
Likes: 0
From: Cincinnati , OH
yup new plugs. todays mission is to replace the ignition coil. after breaking off the gear on the disrtibutor I an just a lil frustrated. it was shooting a red spark through the new wires so i figured since blue is hotter why not. will be a few days till i get to work on it again. a pinpoint test and instrustions would be great! talk to ya later
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
FYI code 24 for the ACT (Air Charge Temperature sensor) can be set for the same reason as the ECT (21): namely running the test with the engine cold. 1st thing I'd do is warm up the engine, then re-run the test to see if both the 21 and 24 go away.
Thread Starter
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Junior User
Joined: Mar 2004
Posts: 53
Likes: 0
From: Cincinnati , OH
welp, the code 89 and 86 have to do with an auto trans and i got a maunal so no worries there. the 21 cuz cold motor and i agree with shorty on the 24. then again, not like i can exactly drive this thing so any info is usefull.....
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
True it's measuring air temperature in the intake manifold. And, though the intake manifold isn't as warm as the coolant at the thermostat housing, it is typically warmer than ambient air. The computer expects to see the intake air temperature sensor above a certain value, though I'm not sure exactly what that value is. The idea behind my post is just to make sure the reason for the code isn't from a cold engine.
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
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Junior User
Joined: Mar 2004
Posts: 53
Likes: 0
From: Cincinnati , OH
Ok get this.... I installed a new 2.9l in my truck. from an 88 to a 91 with the 91 ECU( if it even matters ) and after replacing TUNS of parts; plugs / wires / cap / button / ignition coil / fuel pressure regulator and setting the timing.... it runs like crap !!!!
in fact, nothing I have done so far has changed anything. Today I started pulling wires with it running. the no. 3 and 6 cylanders arent doing anything. they get plenty of spark and fuel and have tuns of compression (like 165 - 175 psi) so.... I looked at the no.6 plug and it has antifreez on it.
OMG I am thinking head gaskit!. but.... plenty of compression and no belching into the radiator. so I am thinking intake gaskit right??
However.... I sprayed carb cleaner all around the intake and no change in idle.... any thoughts on what I should do next??
first lets get the first thing that comes to mind.... the firing order 1-4-2-5-3-6 and yet they are in the correct order...
Any thoughts ? ? ? ? ??????
in fact, nothing I have done so far has changed anything. Today I started pulling wires with it running. the no. 3 and 6 cylanders arent doing anything. they get plenty of spark and fuel and have tuns of compression (like 165 - 175 psi) so.... I looked at the no.6 plug and it has antifreez on it.
OMG I am thinking head gaskit!. but.... plenty of compression and no belching into the radiator. so I am thinking intake gaskit right??
However.... I sprayed carb cleaner all around the intake and no change in idle.... any thoughts on what I should do next??
first lets get the first thing that comes to mind.... the firing order 1-4-2-5-3-6 and yet they are in the correct order...
Any thoughts ? ? ? ? ??????
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
Coolant in the combustion camber usually means cracked heads, pressure test the cooling system. Also look at the oil, if it looks like chocolate milk don't run it or you'll damage the bottom end.
If you find the system is leaking pull the valve covers you might see the leak with the system pressurised.
If you find the system is leaking pull the valve covers you might see the leak with the system pressurised.
Thread Starter
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Junior User
Joined: Mar 2004
Posts: 53
Likes: 0
From: Cincinnati , OH
a cracked head would not have 175 psi of compression though right.....
as is with a head gaskit for that matter I am thinking....
and..... there would be preasure belching into the coolant system
as is with a head gaskit for that matter I am thinking....
and..... there would be preasure belching into the coolant system
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
They are both good points but its uncommon to have the intake leaking. Now that I thought about it more I think the heads like to crack at #1 & #6 which wouldn't fit. I can't recall if there are any coolant passages in that area.
Thread Starter
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Junior User
Joined: Mar 2004
Posts: 53
Likes: 0
From: Cincinnati , OH
any explanation on why the rear two cylanders not functioning?? any similar situations by others?? the anti freez scares me too but gonna try a few cheap tricks to stop that. is intermitent