1987 2.9l running super rich and dying
#1
1987 2.9l running super rich and dying
So this may be a little lengthy but I appreciate any help that comes my way.
I bought an 87 ranger a year ago from a private seller and at that time it was running fine but after a few months I started losing engine power to the point where second gear was my last one that I had enough power to stay in. Truck wouldn't go over 20mph. now the truck floods the engine and wont drive and idles super rough
work done:
throttle sensor
Inertia switch bypass
Fuel pumps
injectors
Regulator
Fuel lines
Spark plugs
Wires
Icm
Timing chain and gears
It's been re-timed
straight pipe exhaust so no cats
air filter
Map sensor
other information: previous owner had ripped out Fuel pump wires when offroading and now has a killswitch in cab. When the truck starts it idles rough as crap, turn off Fuel, evens out, idles high but doesn't shake like crazy, then before it dies turn on Fuel pump and it runs super rough again and may flood out.
I bought an 87 ranger a year ago from a private seller and at that time it was running fine but after a few months I started losing engine power to the point where second gear was my last one that I had enough power to stay in. Truck wouldn't go over 20mph. now the truck floods the engine and wont drive and idles super rough
work done:
throttle sensor
Inertia switch bypass
Fuel pumps
injectors
Regulator
Fuel lines
Spark plugs
Wires
Icm
Timing chain and gears
It's been re-timed
straight pipe exhaust so no cats
air filter
Map sensor
other information: previous owner had ripped out Fuel pump wires when offroading and now has a killswitch in cab. When the truck starts it idles rough as crap, turn off Fuel, evens out, idles high but doesn't shake like crazy, then before it dies turn on Fuel pump and it runs super rough again and may flood out.
#2
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Check fuel pressure, you can rent fuel pressure gauge or buy one they are not too expensive
30-40psi is spec with engine running
And with a new pump and regulator pressure should hold with key off(switch off) at 15-20psi, if injector(s) are leaking
Electric fuel pumps are capable of 80+psi, which is why they need a pressure regulator, "new" just means NEVER EVER TESTED, not it works
Check the vacuum hose on regulator, no gasoline should be present
And it could be a computer issue, open it up and look for leaking capacitors or any circuit board corrosion
30-40psi is spec with engine running
And with a new pump and regulator pressure should hold with key off(switch off) at 15-20psi, if injector(s) are leaking
Electric fuel pumps are capable of 80+psi, which is why they need a pressure regulator, "new" just means NEVER EVER TESTED, not it works
Check the vacuum hose on regulator, no gasoline should be present
And it could be a computer issue, open it up and look for leaking capacitors or any circuit board corrosion
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#6
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And did it hold above 15psi with key off/switch off?
That would tell you if new injector was leaking
In Rangers fuel pressure should hold above 15psi for MONTHS and MONTHS, even over a YEAR
Each injector gets 12volts with key on, on the red wire
Other wire is a Ground from the computer, your 2.9l runs Batch Fire injection so there are only 2 ground wires from computer, each opens 3 injectors every other RPM
Odd and Even, so 1 3 5, then next RPM 2 4 6 open
With key on engine off put volt meter/test light on battery positive and other probe on injector Ground wire, the not red wire, should see 0 volt, test one odd and one even cylinders injector
That would tell you if new injector was leaking
In Rangers fuel pressure should hold above 15psi for MONTHS and MONTHS, even over a YEAR
Each injector gets 12volts with key on, on the red wire
Other wire is a Ground from the computer, your 2.9l runs Batch Fire injection so there are only 2 ground wires from computer, each opens 3 injectors every other RPM
Odd and Even, so 1 3 5, then next RPM 2 4 6 open
With key on engine off put volt meter/test light on battery positive and other probe on injector Ground wire, the not red wire, should see 0 volt, test one odd and one even cylinders injector
Last edited by RonD; 06-20-2022 at 11:01 AM.
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