Fuel Injector Gumming 6G74 TJ

[KurtyFresh]

Posted something related to this before, where on most cold mornings my TJ will almost refuse to turn over, it takes about 3 or so minutes for it to start up and when it does, the usual cold Engine symptoms happen, Stalls, Backfiring exhaust, etc. Could gumming of the fuel injectors be causing the car to not want to start straight away? Because its getting really annoying where i need to go to work and the car won't start up without hassles. I'm going to replace the Fuel injectors in time since the car is rolling the original 2001 fuel injectors. I'd love to know also if this is happened to anyone else

[WytWun]

Almost refuse to turn over? That sounds more like a battery or crook starter electrics than anything else. Even in quite cold conditions this morning, my TJ (parked outside in Canberra) had no trouble firing up with than less than a 1 second hit on the starter and was turning over nearly as vigorously as in summertime while doing so...

[KurtyFresh]

I was told similar to what you said, I'm going to replace the injectors anyway and see whether that solves the issue, it eventually turns over but i sit there pumping the throttle and turning the key and it tries to turn over and you can hear it firing but it just won't turn over, so once i've replaced the injectors and if it continues to do it, i will look into battery and electronic related issues.

[Madmagna]

The term "turn Over" is being mixed up with refuse to "Fire"

If the car is cranking for 3 minutes before the engine starts then in it turning over just fine but not starting or firing

You need to check fuel pressure when cold, put a guage on it for several hours, you may find either the pressure reg or the fuel pump pressure valve has failed and all the fuel is draining back to the fuel tank, may also be one or more injectors leaking and filling up the motor with fuel while car is sitting thus the difficulty in getting it to start as is flooded and again rail empty.

IF you get replacement injectors get a set that have been tested, cleaned and flow tested, dont just get a set from a wrecker. Before you start throwing $$ at the car get the issue diagnosed properly as well

[WytWun]

Ok, if you're using the term "turn over" to mean actually starting rather than just cranking then +1 to what Mal said. Incidentally, pumping the throttle should have little to no effect until the engine is actually running (the ECU won't believe it is running until it is rotating at least ~450rpm) - until then the throttle is not used to adjust fueling. Opening the throttle in your situation may in fact be counter productive as it could be compounding the lack of fuel in the available air by increasing the air supply.

[flyboy]

Agreed.

Pumping the throttle on an electronic injected car is not a good idea.

It used to be done with old carburettor engines, where the accelerator pump would add fuel to help start cold engines. You may be making the problem worse.

[KurtyFresh]

Sorry for the "turn over" mixup, my mistake

Using this information, I'm going to get the car sussed over and get a mechanics opinion as well

Thanks everyone