Toyota 7FGCU30:
Truck is very difficult to start

I have a 7FGU30 Serial # is 62230 it has the 4Y ECS Gasoline engine in it. The issue the truck is having is when you first start it in the morning it will start however if you run it just a few minutes without letting it warm up and shut it back off and attempt to restart it, it cranks and cranks before starting and after it starts its very sluggish, you can attempt to rev it up but it spits and spudders until it clears up, if you let it warm up it starts no problem every time.

What Ive done....
Truck has hot spark while cranking
Replaced electric fuel pump and filter
Replaced both coolant sensors
Replaced plugs
O2 sensor reads.1 lean and 0.9 to 1 volt rich
Engine compression 110 psi across all holes(book says spec it 178 good 122 minumum)

Any tips or ideas would be greatly helpful cannot find anything else and at a dead end.
  • Posted 15 Nov 2014 18:38
  • Discussion started by cody_w
  • Kansas, United States
Showing items 1 - 12 of 12 results.
My customer reported to me that the EFI light is on and the engine is running very poor with foul smelling exhaust. I reviewed my Toyota manual and found a list of engine codes. there is a four prong female plug right by the ecm I assume for diagnostics. Is there a way to get the EFI light to flash me a code to further my troubleshooting?
  • Posted 11 Dec 2014 00:47
  • Reply by cody_w
  • Kansas, United States
Have you performed vacuum test
  • Posted 19 Nov 2014 06:54
  • Reply by forkliftpete
  • Ontario, Canada
I have mainly lp trucks but they are known for sludge build up in the throttle body. It can hang up the throttle plate creating issues. Loosing up the throttle body will allow better air intake and give you a different reading. You also should disconnect the gray and green connectors on the relays.
  • Posted 18 Nov 2014 09:55
  • Modified 18 Nov 2014 10:07 by poster
  • Reply by rogeriwt
  • Massachusetts, United States
no I have not cleaned the throttle body and no I did not loosen the throttle body during the compression check how would have that affected the compression check may I ask and would a dirty throttle body be a possible cause to the issue that I am having thanks for the help.
  • Posted 18 Nov 2014 09:24
  • Reply by cody_w
  • Kansas, United States
Have you cleaned out the throttle body? When you did your compression check did you loosen up the throttle body?
  • Posted 18 Nov 2014 09:19
  • Reply by rogeriwt
  • Massachusetts, United States
4Y engine has hydraulic lifters, no valve lash adjustment.
  • Posted 17 Nov 2014 10:02
  • Reply by L1ftmech
  • Tennessee, United States
Compression was checked with engine hot. I did not sqirt oil in the cylinders but I would have to try to see if that ups the compression. I have not checked valve lash but could check that as well. Thanks for the suggestions.
  • Posted 17 Nov 2014 05:36
  • Reply by cody_w
  • Kansas, United States
When you did your compression test did you do it with engine cold or at operating temp? Did you do a second test with a few squirts of oil in each cylinder and retest?? If the manual is stating 122 minimum and you are getting only 110 then it is low on compression and could be a part of your issue.....have tou checked and adjusted your valve lash??????
  • Posted 17 Nov 2014 05:26
  • Modified 17 Nov 2014 05:27 by poster
  • Reply by kevin_t
  • Pennsylvania, United States
No the truck is gasoline only no propane. It starts decent at start up but after it starts if you run it no longer than 5-6 minutes and shut it off it acts up(as described above) but if it runs up to operating temperature it starts fine with no problems and during this time there is no check engine light.
  • Posted 17 Nov 2014 02:09
  • Reply by cody_w
  • Kansas, United States
Is it dual fuel?
You may have an injector stuck open, flooding the engine warm.
  • Posted 17 Nov 2014 01:13
  • Reply by EasiTek
  • Ontario, Canada
Thanks for the info, it was insiteful however I forgot to mention this motor is a electronic fuel injected motor completely drive by wire electronic motor any ideas?
  • Posted 16 Nov 2014 00:54
  • Reply by cody_w
  • Kansas, United States
Since it's gasoline, it changes the normal diag of a propane fueled engine. Sounds exactly like any old chevy from the 80's with carburetor. Guy would start the car cold, then go for cigarettes around the block. The engine started fine cold, and had enough heat for a restart WITHOUT the choke. But when he got back in the car a few minutes later, the choke came back on full and flooded the engine....if he touched the accel even slightly while cranking. The only way you could do a warm restart was to floor the gas pedal. The car started but smoked and ran rough til it cleared. But you never had an issue if the car reached operating temp.
Youre choke system may have lost power to it's internal heater. Check that first. Make sure the linkage is opening the choke when the gas pedal is fully depressed. Usually the choke cant close unless you open the throttle a bit but some carbs did not have that feature. You may be running rich or worse have a buildup of carbon in the manifold. Last one I did had an inch of carbon under the carb!
If you dont want to spend much more time, just make sure the operator doesnt touch the gas on warm restart and floor the pedal if it doesnt start right away.
  • Posted 15 Nov 2014 22:39
  • Reply by EasiTek
  • Ontario, Canada

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