88 Bronco 2 No spark

[Mhfco6]

I have been doing a lot of work on this 88 bronco 2 that I inherited. It has not started since in my possession, or for the past 10 years. I pulled #1 plug to TDC and ran the crank pulley the rest of the way to 10 BTDC. I marked the dizzy and made sure they rotor was pointing to #1 plug wire, installed the cap and wires in correct firing order; 1,4,2,5,3,6. I have fuel at the rail but no spark and it will not start. Any suggestions of things to check? Thanks!

 

[franklin2]

Where and how did you check for spark?

If you figure out the spark thing, and it still will not start, the next thing to ask; How did you figure out #1 TDC? If you just brought #1 piston to the top, that is not necessarily TDC on #1. The piston comes up twice in the 4 cycle engines, once for exhaust and once for firing TDC. If you just bring #1 piston to the top you have a 50% chance of being correct.

 

[Mhfco6]

Where and how did you check for spark?

If you figure out the spark thing, and it still will not start, the next thing to ask; How did you figure out #1 TDC? If you just brought #1 piston to the top, that is not necessarily TDC on #1. The piston comes up twice in the 4 cycle engines, once for exhaust and once for firing TDC. If you just bring #1 piston to the top you have a 50% chance of being correct.

Sat the # 5 spark plug against the block and few other spots while cranking and didn’t see a spark. It’s was on the compression stroke, I always feel for the big puff of air!

 

[Uncle Gump]

Try the coil wire... use one of these.

 

[Mhfco6]

Try the coil wire... use one of these.

View attachment 93156

could be bad out the box but put brand new wires on yesterday.

 

[RonD]

As said TDC on crank pulley denotes #1 and #5 TDC on most V6 engines, not just #1, but you would still have spark, just not at the right time for engine to start

50/50 test
Spray fuel into the engine
Try to start
If it fires you have spark, but may be out of time if it doesn't start
If it doesn't fire then no spark(maybe no compression)
50/50 instant results


If no fire/no start
Test coil wire for 12volts key on

Replace TFI module if you have 12volts at coil
TFI modules are common failure point on 2.9l engines

 

[Mhfco6]

As said TDC on crank pulley denotes #1 and #5 TDC on most V6 engines, not just #1, but you would still have spark, just not at the right time for engine to start

50/50 test
Spray fuel into the engine
Try to start
If it fires you have spark, but may be out of time if it doesn't start
If it doesn't fire then no spark(maybe no compression)
50/50 instant results


If no fire/no start
Test coil wire for 12volts key on

Replace TFI module if you have 12volts at coil
TFI modules are common failure point on 2.9l engines

Didn’t have SF but I used some carb/brake clean. Still nothing. I’ll test for 12v at coil and let you know what I find, thanks!

 

[Mhfco6]

I probed and tested the red/green wire and green/yellow wire. Both on fender wheel and at dizzy.

 

[Mhfco6]

The TFI is original motorcraft and only has 1 mounting screw instead of 2. I’ve tried every small socket I have, some searching says it’s a special tool needed to remove? Can anyone say 100%?

 

[gaz]

@Mhfco6 ,
Of the top of my head, I remember 7mm. I will put a socket on it and let you know for certain.

There is a custom tool or adapter but again, I remember it being a 7mm socket.

 

[Uncle Gump]

I think its a 5.5mm

 

[franklin2]

I think its a 5.5mm

I think you are right and you have to take a regular socket and grind the outside down for it to fit. What is Ford thinking when they come up with this stuff I'll never know.

On the puff of air for #1 for TDC, good job. Just checking, do not know what people know and what they don't know through the computer.

 

[Mhfco6]

Deepwell 7/32 got the job done, but still won’t come off. If there’s a 2nd screw damn if I can see it.

 

[RobbieD]

Deepwell 7/32 got the job done, but still won’t come off. If there’s a 2nd screw damn if I can see it.

Should be 2 screws.

Try to CAREFULLY pry on it. There's a heat transfer paste that dries out and kind of bonds the module to the dizzy.

MAKE SURE that you use new heat transfer paste on the new module; a new module should include a packet of paste in the box.

QUOTE="franklin2, post: 1971820, member: 107114"]
I think you are right and you have to take a regular socket and grind the outside down for it to fit.
[/QUOTE]

Exactly what I did.

 

[franklin2]

There are two screws.