Gen 3 coyote issues

[Lucky's]

Hi Guys,
Has anyone had no fuel and/or no spark issues with the Gen 3 yote? Somehow we are losing power when we go to the start position with the key. We've triple checked the wiring diagrams and everything seems to be legit there.
First Coyote install on one of these builds. Thanks for any help possible.

[BradCraig]

Hi Guys,
Has anyone had no fuel and/or no spark issues with the Gen 3 yote? Somehow we are losing power when we go to the start position with the key. We've triple checked the wiring diagrams and everything seems to be legit there.
First Coyote install on one of these builds. Thanks for any help possible.

Does it turn over?

[Lucky's]

Does it turn over?

yes

[BradCraig]

Mine would not start initially. Using a test light I validated that the coil and injectors were firing (they were). From there my assumption was fuel related so I validated the pump was running and I had fuel pressure and all checked out there. In the end I think it just took a while for the air to get purged out of the fuel system and it started after a few minutes of cranking.

[delta0014]

Mine would not start initially. Using a test light I validated that the coil and injectors were firing (they were). From there my assumption was fuel related so I validated the pump was running and I had fuel pressure and all checked out there. In the end I think it just took a while for the air to get purged out of the fuel system and it started after a few minutes of cranking.

Pretty much exact same thing I went through...
Mine wouldn't initially start either. Checked spark, everything was firing. Bought a noid light to check the fuel injectors, checked wiring, redid all the ground wires. Fuel was getting to the pressure regulator.
Finally I just cranked it over for what seemed like an eternity and boom, it finally went. After it started that initial time, I haven't had any problems since.

[edwardb]

Responded to the PM asking for more details. FWIW, this is the totally unedited version of the first start of my Gen 3. Before cranking, confirmed the fuel system had pressure. Could hear the fuel pump switch on briefly and had a reading at the underhood regulator gauge. Cranked for 5-6 seconds and lit off. Now starts in 1-2 seconds max. The Gen 2 in my Roadster was much quicker. https://youtu.be/4ytnm8CV5ZQ

[Lucky's]

Mine would not start initially. Using a test light I validated that the coil and injectors were firing (they were). From there my assumption was fuel related so I validated the pump was running and I had fuel pressure and all checked out there. In the end I think it just took a while for the air to get purged out of the fuel system and it started after a few minutes of cranking.

We have good fuel pressure. but but lose power to the injectors and coils when we crank.

[Lucky's]

did you have your tach hooked up for initial fire up?

[Railroad]

Could be a weak battery, poor + connection, or engine is not grounded.
You can do a quick ground with a jumper cable from engine block to battery or frame ground.

[Lucky's]

Could be a weak battery, poor + connection, or engine is not grounded.
You can do a quick ground with a jumper cable from engine block to battery or frame ground.

Brand new battery fully charged, We already check the ground strap tp make sure... we're still stumped. We thought it may be a ground issue somewhere but not sure

[frd2]

Does the Ford ECU maintain power (lights) when cranking?

Have you tried putting the key in run and then shorting across the starter to crank?

[Lucky's]

Does the Ford ECU maintain power (lights) when cranking?

Have you tried putting the key in run and then shorting across the starter to crank?

Yes we have power to the computer.. But, we did not try to start that way.. by shorting it. but we will

[Lucky's]

OK so here is the issue. we have power going to the computer and it stays on in crank mode.. But, we have no ground signal to the coils or injectors. any ideas fella's

[edwardb]

Some of the questions I asked in my PM: Ford Performance control pack? How do you have the pump and starter wired? Controlled by the Coyote system? If so, it's strange to me the PCM would initiate the start sequence, which means it has +12V and ground (among other things) but the ignition wouldn't be working. Do you have the engine itself grounded? Normal practice is at least one large ground strap from one of the starter bolts to the chassis. I add a second from somewhere on the engine itself to the chassis.

[Railroad]

A couple of things come to mind. If you are feeding your computer wire HAT (hot at all times) off the starter, you could be reducing the power to the ecu enough to create an issue. If this is the case the solution will be to run the HAT wire directly to the battery.
Someone on here had an issue with the injector grounds. It seems like the engine was trying to ground through the wiring harness and smoked one of the wires.
They contacted Ford Performance and got some help and the engine running.

[BEAR-AvHistory]

Will just throw this on the wall. Check you ignition key connections. Had one wire out of place & had the same problem.

[Jryasko]

Couple things on the Gen 3 1st start, which I did a couple of weeks ago. I thought I had read the fuel pump would kick on for 10 seconds when the key is just turned on. I attempted to purge the fuel lines by turning the key on, at first I thought I had an issue with the fuel pump as it was not turning on. Had wired it to be controlled by the Ford ECM but use the RF relay in the chassis harness. Jumped the relay in the harness to check wiring and see if it would turn on, fuel pump worked fine. Called Ford Tech and was told the signal from the Ford controller when key is just turned to on is only 2 seconds. Cranked engine and had fuel pressure on the regulator gauge. While cranking and attempting to start, starter just quit. Checked all connections and let it sit about 10 minutes, cranking resumed. It did take a little cranking to purge the air out of fuel system. Contacted Ford and asked about the starter issue, was told there is a protection built in for the starter which cuts it off after so much time to protect it.

[Lucky's]

Couple things on the Gen 3 1st start, which I did a couple of weeks ago. I thought I had read the fuel pump would kick on for 10 seconds when the key is just turned on. I attempted to purge the fuel lines by turning the key on, at first I thought I had an issue with the fuel pump as it was not turning on. Had wired it to be controlled by the Ford ECM but use the RF relay in the chassis harness. Jumped the relay in the harness to check wiring and see if it would turn on, fuel pump worked fine. Called Ford Tech and was told the signal from the Ford controller when key is just turned to on is only 2 seconds. Cranked engine and had fuel pressure on the regulator gauge. While cranking and attempting to start, starter just quit. Checked all connections and let it sit about 10 minutes, cranking resumed. It did take a little cranking to purge the air out of fuel system. Contacted Ford and asked about the starter issue, was told there is a protection built in for the starter which cuts it off after so much time to protect it.

we just got it to fire... The one wire they tell you to cut in the manual, we hooked back up. ugh

[edwardb]

we just got it to fire... The one wire they tell you to cut in the manual, we hooked back up. ugh

Curious... what wire did they tell you to cut that made it work when reconnected?

[Railroad]

I'll bet it is the tan wire. I cut it also. Gen 1 Coyote cranks and runs, but no inertia switch function.

[dhuff]

Responded to the PM asking for more details. FWIW, this is the totally unedited version of the first start of my Gen 3. Before cranking, confirmed the fuel system had pressure. Could hear the fuel pump switch on briefly and had a reading at the underhood regulator gauge. Cranked for 5-6 seconds and lit off. Now starts in 1-2 seconds max. The Gen 2 in my Roadster was much quicker. https://youtu.be/4ytnm8CV5ZQ

Even after running the fuel pump continuously and setting the fuel pressure mine took longer that that to fire off the first time.