2.9 no start
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
ECT is coolant temperature sensor. It's located near the upper radiator hose outlet at the front of the motor.
Does the truck start and run if you unplug the MAP sensor's electrical connection?
Does the truck start and run if you unplug the MAP sensor's electrical connection?
Thread Starter
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Senior User
Joined: Sep 2016
Posts: 111
Likes: 0
From: Las Vegas
The truck started with the MAP disconnected.
It didn't run for long and while the map was disconnected I had to give it quick throttle pump until about 1/2 way to get it to start. So I reconnected the map and when I pressed the gas pedal 1/2 quickly while cranking and the truck started.
I turned the truck off and waited about 10 min then I re attempted to start the truck again and it only turned over. I cycled the ignition a could times then it started.
Also I measured the time the fuel pump ran.
From the first click that engages, the pump runs for about 1.2 seconds before cutting out then .5 seconds later there's a second final click.
It didn't run for long and while the map was disconnected I had to give it quick throttle pump until about 1/2 way to get it to start. So I reconnected the map and when I pressed the gas pedal 1/2 quickly while cranking and the truck started.
I turned the truck off and waited about 10 min then I re attempted to start the truck again and it only turned over. I cycled the ignition a could times then it started.
Also I measured the time the fuel pump ran.
From the first click that engages, the pump runs for about 1.2 seconds before cutting out then .5 seconds later there's a second final click.
Thread Starter
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Senior User
Joined: Sep 2016
Posts: 111
Likes: 0
From: Las Vegas
I got a round to replacing the MAP and the Fuel Relay.
There was no difference in starting with the new MAP and after spraying ether to get it started, there was no difference in running.
I then replaced the relay and boy is it easier to start. I only need to turn the key 1-2 times with the throttle pressed in at 1/2 to 3/4 and she fires up.
While it was running I disconnected the old MAP and there was a change in running. I then disconnected the ATC on the intake and there was another noticeable change. I turned off the truck and disconnected the ECT and there was a quick drop in RPM when right after starting.
There was no difference in starting with the new MAP and after spraying ether to get it started, there was no difference in running.
I then replaced the relay and boy is it easier to start. I only need to turn the key 1-2 times with the throttle pressed in at 1/2 to 3/4 and she fires up.
While it was running I disconnected the old MAP and there was a change in running. I then disconnected the ATC on the intake and there was another noticeable change. I turned off the truck and disconnected the ECT and there was a quick drop in RPM when right after starting.
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Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Can you watch the fuel pressure gauge while somone attempts to start the truck?
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Senior User
Joined: Sep 2016
Posts: 111
Likes: 0
From: Las Vegas
So the fuel pressure when turning the key to on once was 8psi
It took about 4 cycles to get the pump at 36 psi but it held when I got cranked it
After quite a few tries the truck started up and was holding at 30 psi flat
And only went up to 32 psi when floored
It took about 4 cycles to get the pump at 36 psi but it held when I got cranked it
After quite a few tries the truck started up and was holding at 30 psi flat
And only went up to 32 psi when floored