Starting issue - explained - need assistance

[shawski]

Starting issue '87 22re - explained - need assistance

1987 22re 4runner manual

Hi all,
I've read many different starting issues on this board, but I may have a new description (or at least I haven't found this symptom description yet).

Scenarios:
Engine completely cold (sitting off for at least 4-6 hours) - the truck fires up on first crank, no questions.

Engine recently operating prior to start (engine has been off for 1 second to ~5 minutes) - the truck fires right up, no questions.

Engine semi-recently operating prior to start (engine has been off for ~5 minutes up to ~3 -4 hours) - This is where an issue arrises. To get started I do 1 of 2 things; 1, crank for 1-2 seconds then stop crank, then crank again for the easy (80% of time) start. 2, crank the starter and hold the crank for approximately 6-8 seconds, to result in a start. Neither of these two approaches give me a "clean" start either, it's sort of boggy until idle settles in.

Fuel rail pressure test shows - 38psi.

Thoughts on should I look at electrical or mechanical first?

Thank you
Shaw

 

[shawski]

Gotta love cheap tricks website! I just found this link/write up and am going to try this right now, since my symptoms are very similar.

Toyota 4Runner and Pickup: Cheap Tricks

Still feel free to leave comments/solutions, should this cheap trick not work. And because it's technically not the solution, it's just a work around.

 

[dsalazar88]

Engine temp

The only thing that is changing with those scenarios is the engine temperature.

If the engine is cold or hot it's ok but if it's warm it has trouble, weird. No idea man.

 

[wallytoo]

when it's warm, and has been sitting for more than five minutes, pull the vacuum line from the fuel pressure regulator. if the line is full of gas, you've found the problem; a failed FPR.

if the line is not full of gas, your problem is elsewhere.

 

[Bob22222]

Could it be an issue with the cold start injector (or more likely the temperature sensor that controls it)? When you experience the non or difficult start issue you might want to pull a plug an see if it's gas fouled or close to it. I think you check the sender/sensor by checking resistance in hot, cold, and in your case at medium temps using an ohm meter with the ignition off and the cold start injector disconnected.
Aside, its a good idea to have the ignition off when connecting and disconnecting any electrical connections anyway but you know that already.