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454 tbi no fuel question

I haven't had alot of time to look at this further, Weather isn't cooperating. I did check the injectors with a niod light and they do not come on, flicker, or anything else. I picked up an ignition module today. I'm going to swap it out tomorrow after work.

I will let you know what i find. Thanks for all the help. Maybe I won't be such a noob with TBI after this thing gets figured out.:doah:
 
Swapped out the Ignition module and it didn't help. At least I have a spare now.:doah:

I checked the pick-up coil and got continuity but I forgot my good Fluke at work. Read 00. I used my T1000 fluke.

I'm guessing I should quit checking with a digital meter and break out the old analog. If I can find it.

Any more suggestions?
 
I finally got back to working on this truck. Found out tonight that over the spring it developed a huge hole in the gas tank. So now i'm putting in a temp fuel cell just to get it running.

I pulled one of the fuel pumps and it works fine, so I will use it. Need to get a filter tomorrow.
 
I'm trying to swap out the pickup coil. Is the star shaped piece supposed to slide off? I sprayed some PB Blaster on it to free it up.

I'm going to finish dinner and try to get it off again.
 
This whole project is starting to honk me off. The frustrating thing is I can get it to run if I manually feed it fuel.:mad:
 
I found this schematic online.

According to this there is a purple/white wire and 3 amp fuse comming off the starter going to the ECM.

I don't have 12volts at the ECM with the key in run. I'm thinking I should. I thought about running a jumper wire to this pin but don't want to fry the ECM.

The ECM does have 12 volts at several other locations.

What say the experts?



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You do need 12v at the ECM on that purple wire. It's the crank sensor and it won't run without it. Just find the right pin.
 
Thats what I figured. I traced the purple wire to the firewall. It must branch off under the dash.

According to that print it comes out the ECM (B5) and goes to the ignition module. Or am I reading that wrong?

Thanks, bruiser
 
79BRUISER said:
According to that print it comes out the ECM (B5) and goes to the ignition module. Or am I reading that wrong?
Click to expand...

no, that purple wire is for EST. The crank signal goes to c9. It's not shown in that diagram. There's an ECM pinout online I can try and dig up.
 
I checked the pick-up coil and got continuity but I forgot my good Fluke at work. Read 00. I used my T1000 fluke.
Click to expand...
Should NOT have 00 continuity on the PU coil. Should read 500-1500 ohms. If you are reading 00 it is bad.
You have to pull the distributor, remove drive gear, and pull the shaft to replace the PU coil.
If the ECM does not see a spark reference from the pick up coil it will not fire the injectors.

You do need 12v at the ECM on that purple wire. It's the crank sensor and it won't run without it. Just find the right pin.
Click to expand...
There is NO crank sensor on TBI. The pick up coil and distrubutor module do that job.
 
There is NO crank sensor on TBI. The pick up coil and distrubutor module do that job.
Click to expand...

I said crank signal, not sensor. Tbi uses a "starter crank" signal at the ECM to turn the injectors on as well.
 
bp71k5 said:
You do need 12v at the ECM on that purple wire. It's the crank sensor and it won't run without it. Just find the right pin.
Click to expand...

I rest my case. It is the crank siginal. Did not want the guy looking for a crank sensor.:D
That being said. I think the only time you have 12V on the wire that comes off the starter solenoid is when The key is in the Start position. Rest of the time it has no voltage even if the ignition is on.
 
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