starts and stalls

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Straydog

Straydog

Joined
Oct 26, 2006
Threads
19
Messages
368
Location
Camp Hill, PA
After all the crap I went threw to get this to run a couple weeks ago it ran perfect all weekend. No issues. Brought it home. Parked it for a week. Now its at it again.

Its a 22re. I fired it up and it starts immediately and about 10 seconds in(about the time it levels off) it dies. If you tap the starter it will run another ten seconds or so(I know this can't be good for it). If you keep tapping the starter it will keep running.
??????????

I've been in the search here, POR, cheap tricks, and random google for three hours and can't come up with any references to something like it. Anyone heard of this.
 
Last edited:
Change your oil and put some good stuff in it. Sounds like you have some bad friction somewhere. Do the oil to be safe its not internal. Before I seized the motor in my truck I was coming down the road and it would stall with the clutch in. Still would start rite back up though.
 
It has mobil 1 with less than a thousand miles on it.
Motor was rebuilt last summer.
 
But it stalls reguardless, clutch in/out, foot on gas, doesn't matter.
You can start it and stomp the gas and it will tach 4 grand and still shut off like you turned the key off
It stays started and runs normal if every ten seconds(or so) you turn the key enough to engage the starter, but it won't work if you try to hold the key turned to just before the starter engages.

I'm not actually using the starter to keep it running, it stays running no matter how long you hit the starter for.
 
No, you can even hear it swing back when it stalls. I tried jumping the fuel pump just in case, still stalled.

Is there any thing other than the starter that is kicked in during the start cycle? I'm thinking there's a clue there. I mean, why would it keep running just by tapping the starter? What else would be wired to that part of the switch. Is there a full power to the coil wire like on FJ40's?
 
Ok, checked the afm, tested fine. Wife spotted wires melted above the frame. Yep, their to the fuel pump. Must have got them when I welded the sliders on. Fixed them, jumped the fuel pump from the bat. and it ran. So I tried jumping it from the diagnostic port and it runs fine. I'm guessing the ecm is burnt. I get no signal(voltage) from the fuel pump wire coming from the ecm..

Anyone have a second opinion?
And if I'm right, anyone know where I can get a good deal on an ecm?
 
Straydog said:
... I'm guessing the ecm is burnt. I get no signal(voltage) from the fuel pump wire coming from the ecm..
Click to expand...

IIRC the ecm doesn't control the pump after the motor is running, have you checked the fuel pump relay? Maybe called the opening relay?
 
Straydog said:
Ok, checked the afm, tested fine. Wife spotted wires melted above the frame. Yep, their to the fuel pump. Must have got them when I welded the sliders on. Fixed them, jumped the fuel pump from the bat. and it ran. So I tried jumping it from the diagnostic port and it runs fine. I'm guessing the ecm is burnt. I get no signal(voltage) from the fuel pump wire coming from the ecm..

Anyone have a second opinion?
And if I'm right, anyone know where I can get a good deal on an ecm?
Click to expand...

good.

it sounds like you are headed in the right direction.
 
Tools R Us said:
IIRC the ecm doesn't control the pump after the motor is running, have you checked the fuel pump relay? Maybe called the opening relay?
Click to expand...

the AFM has a switch that closes the circuit for the pump.

it closes when the flapper opens, while air is being sucked thru
 
WristPin said:
the AFM has a switch that closes the circuit for the pump.

it closes when the flapper opens, while air is being sucked thru
Click to expand...

Correct, the AFM signal goes to the relay closing it, the relay supplies the high amperage power to the pump. IIRC the ECM supplies the signal to close the relay when the starter is running, then the AFM switch takes over when the starter stops.

The pump power comes from the 15 amp EFI fuse, through the main relay, then the opening relay to the pump.

If the fuse or main relay were bad the motor wouldn't run at all.

The motor runs when the starter is engaged. So the ECU starter input is good, the wiring is capable of delivering power to the pump and the pump is capable of delivering sufficient fuel for the motor to run.

The AFM output signal tests out, but the motor still dies. My next check would be the circuit opening (fuel pump) relay. Is the AFM signal getting to it? Is it staying closed when AFM signal is present? When it's closed by the AFM signal, does it have good power output to the pump?
 
Where is this opening relay? I replaced the main relay last time I had trouble(and checked it this time). The efi fuse is the first thing I checked. But I can't find another relay. Is it under the hood? I checked the Afm but don't know where this is to test it.
 
Straydog said:
Where is this opening relay? I replaced the main relay last time I had trouble(and checked it this time). The efi fuse is the first thing I checked. But I can't find another relay. Is it under the hood? I checked the Afm but don't know where this is to test it.
Click to expand...

IIRC in the passenger side kick panel area.
 
Nope, no relay there. And no fuel pump, opening relay listed in any of my manuels.
 
i have an idea

when it dies, or doesnt start, turn IGN on. probe the AFM harness connector for voltage.

is there any voltage?

if no, there has to be a loose connection. do you have a kill SW installed? verify proper connection.

pull out some of you fuses under the dash and make sure they aint all corroded. and better yet, skuff up the blades so it has good connections.

and speaking of good connection, have you made sure the alt+ wire is tight and clean?

remove the battery terminal, take a old knife and scrape the post and inside of the terminal and make it shiny.

this will insure optimum connection
 
Battery is new and fuses are clean. I'll check the alt. and probe the AFM. There was a kill switch, I removed all that and it ran great for the two weeks after.
There was a short, thats what I'm worried about. Whats a PCM?

I don't own any mopars:) Two toys, a Chevy, and the :princess:'s Nissan POS.
 
Straydog said:
Nope, no relay there. And no fuel pump, opening relay listed in any of my manuels.
Click to expand...

I have never seen an EFI Toyota that didn't have a relay to control the fuel pump? On your wiring diagram, where does the wire that powers the pump come from? The opening relay is powered by the main relay, the AFM output is ground and it closes the opening relay, sending power to the fuel pump. This is the circuit from a ’85, is yours different?
FuelPump.gif
 
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