Spout question
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Tuned
Joined: Aug 2007
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Spout question
1988 F250 351
I changed my injectors and eliminated the #41 lean code. The truck still had a severe electrical miss. I changed the wires and plugs with no difference. I removed the spout shorting bar and the truck performed perfectly. Even in OD at less than 1000 RPM with WOT I could not get the truck to miss once in 10 miles in the moutains. So obviously when the spout is in something is not right.
Any ideas as to how to further troubleshoot?
I changed my injectors and eliminated the #41 lean code. The truck still had a severe electrical miss. I changed the wires and plugs with no difference. I removed the spout shorting bar and the truck performed perfectly. Even in OD at less than 1000 RPM with WOT I could not get the truck to miss once in 10 miles in the moutains. So obviously when the spout is in something is not right.
Any ideas as to how to further troubleshoot?
Posting Guru
Joined: Aug 2007
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From: Belle Mead NJ
If its running when the spout is out, then either the base timing is too advanced, or the computer is advancing it too much. Try to reset you base timing to 10* then reconncet the spout and see how it runs.
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Tuned
Joined: Aug 2007
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Timing is OK and on the 10 degree mark with the spout out. In fact it's rock solid on the 10 degree mark. What happens is that when the spout is back in the timing jumps around the 10 degree mark and there is a noticable miss which is light at idle but increases dramatically when under load. The truck bucks, kicks misses and generally acts like bad wires or plugs. That is why I changed them first. But last night at about 3:00 AM I woke up and had this idea to pull the spout and see if the truck would run. Was I surprised when it was perfect. Not one miss ever no matter what the load.
So is it the TFI module or the spout wire itself? I just happen to have another TFI module. I'm going to change that to see if that's it.
Any suggestions ? I'll ask Bill (Subford) if he doesn't see this post beforehand. I actually found a wiring diagram on fordfuelinjection that shows the TFI and the input/outputs. I need some guidance on how to interpret it.
I finally can see the light (sort of) after six months of major frustration.
So is it the TFI module or the spout wire itself? I just happen to have another TFI module. I'm going to change that to see if that's it.
Any suggestions ? I'll ask Bill (Subford) if he doesn't see this post beforehand. I actually found a wiring diagram on fordfuelinjection that shows the TFI and the input/outputs. I need some guidance on how to interpret it.
I finally can see the light (sort of) after six months of major frustration.
Posting Guru
Joined: Aug 2007
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From: Belle Mead NJ
Umm i know that the spout connects, so the computer can control the timing advance. Did you ck the vacuum hose that goes from the upper to the vac timing advance thing on firewall. I know that hose was messed up on my stang and it ran like crap. It should be a black hard plastic line. 1 end will in where all the vac lines are, and the other end will be like under where the passanger wiper is.
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Tuned
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Posting Guru
Joined: Aug 2007
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From: Belle Mead NJ
It should my 88 mus does. Umm let me take a pic of mine and see if you have it. Im prob not calling it by the right name, its prob something else. Here is what the item is.
Last edited by 95F350XL; Jan 22, 2008 at 12:27 PM.
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Tuned
Joined: Aug 2007
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That's the MAP sensor and vacuum line. My MAP is new and the line is OK. My problem really seems electrical.
I changed the TFI module and the truck ran poorly with the spout in. Spout out and it ran fine. Of course the acceleration is not as fast I think because the computer isn't in control of the timing. But there is not any bucking and jerking.
I changed the TFI module and the truck ran poorly with the spout in. Spout out and it ran fine. Of course the acceleration is not as fast I think because the computer isn't in control of the timing. But there is not any bucking and jerking.
Posting Guru
Joined: Aug 2007
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From: Belle Mead NJ
My bad with the map, sensor lol. I know i think subford was saying once that with the spout disconnected, that the computer is taking out. I wonder if something is wrong with ur comp. Or a wire that goes from the comp to the spout or dist is messed up.
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Tuned
Joined: Aug 2007
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I've already put in two computers. Like you I'm thinking a wire or the distributor. The distributor is under warranty and I'm getting a replacement tomorrow AM.
I have to talk to subford to see if he has any other thoughts as to what it might be or how to test.
I have to talk to subford to see if he has any other thoughts as to what it might be or how to test.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by antony25
Check your timing mark against the crankshaft keyway in case the outer ring of the balancer has shifted. The keyway should be at 12:00 with the timing mark at 0*
If OK check for slop in the timing chain.
The TFI and PIP sensor should be OK.
Make sure the SPOUT wire is good all the way from the TFI to the computer and check the pins in the computer plugs
Make sure your computer ground is good at the battery post and you have a fully charged battery.
Where are you getting the computers from?
Here is a diagram of the Ignition System.
/
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Tuned
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Thanks for all the responses and thanks Bill for the ignition diagram.
I'll check the timing mark/pully keyway alignment.
The engine was a reman. and I put on the timing chain and water pump assembly before I reinstalled the engine. That was less than 1000 miles ago. The chain looked tight - no slop at that time.
Would a continuity check on the Spout wire from the TIF to the computer be sufficient?
When you say the computer ground at the battery do you mean the black/green strip wire?
The battery is new. The alternator is charging 14.5 DCV.
The computers are remans. from Cardone through Advance.
I'll check the timing mark/pully keyway alignment.
The engine was a reman. and I put on the timing chain and water pump assembly before I reinstalled the engine. That was less than 1000 miles ago. The chain looked tight - no slop at that time.
Would a continuity check on the Spout wire from the TIF to the computer be sufficient?
When you say the computer ground at the battery do you mean the black/green strip wire?
The battery is new. The alternator is charging 14.5 DCV.
The computers are remans. from Cardone through Advance.