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Trooper cranks but wont start

rippin it in utah
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rippin it in utah Newbie

rippin it in utah

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Hello Everyone,

I have been a member of the forum and enjoy reading your posts this is my first one. I have had my T4 for over a year, more than 1600 miles on it now. I was having idle and starting problems. I had the temp sensors changed, replaced the fuel filter, cleaned the plugs (new ones in the mail) replaced the alternator and a new battery.

When I get the thing running it really idles and runs much better, however, it is running hot now and never did that before. (Ideas???? I bled the cooling system at least 6 times like Joyner said to do)

The hard starting problem isn't fixed. The engine cranks but it sounds like it isn't getting fuel to turn over. This happens after it sits overnight. IF I can get it started, I don't have the starting problems again until it sits overnight or longer.

I have virtually no mechanical skills so I can't be precise on what I think the problem is. I won't push start now (which I have been able to do in the past.) The engine continues to crank over and over until the battery starts to get drained and I am at a loss!!!! Last year I had the starter replaced because I had issues with that. (Thank goodness for extended warranties!)

Any help or thoughts would be greatly appreciated. Want to go out and play some paintball with my sons this coming weekend!

ps.... Kinarfi, I live in Henderson, as I think you do also. Would love to talk sometime I really like reading your posts.

Thanks

Todd

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live4dirt
live4dirt

thanks for all the info guys. i,ll take your suggestions and try them. the group i ride with are big into dessert racing. infact we host uor own race 2nd weekend in august. so we'll get this figur

oceanjake Rookie

oceanjake

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My 08 trooper is no longer "turn-key". it won't start unless i give it some gas. once it's running it idles down and acts perfectly normal. any ideas? on dirtbikes it's usually valves, but this ain't no dirtbike. the mighty trooper has about 700km on it and I've done nothing to it so far but an oil change. what should I try and in what order?

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oceanjake Rookie

oceanjake

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rocmoc, yes i'm waiting for the fuel pump to pressurize the lines and the fan to stop. without applying any throttle it will kick over and immediately die. it appears to be a tuning problem....just wondering what an experienced mechanic would try first to diagnose the problem. it starts everytime if I give it gas....

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rocmoc Grand Master

rocmoc

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First we need a experenced mechanic and it an't me, LOL! I would some injector cleaner in the fuel first. With the new blend of gas it is more about time than miles. If the gas sits anytime at all it scales and is very hard on rubber hose. The stuff is crap! I have to do this with my trailer gen as it will sit a month between uses.

Next; FLATBED or one of the dealers on here, what ya think?

rocmoc n AZ/Mexico

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Guest Lenny

Guest Lenny

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rocmoc, yes i'm waiting for the fuel pump to pressurize the lines and the fan to stop. without applying any throttle it will kick over and immediately die. it appears to be a tuning problem....just wondering what an experienced mechanic would try first to diagnose the problem. it starts everytime if I give it gas....

I'm going to go out on the limb and sujest you try something. Set your fuel regulator pressure to be up about 5 or 10 pounds. When you first start a engine, it want's an extra shot of fuel. The engine is cold, the mixture is not quite as explosive. When it's first cranked, you do crank it don't you with the crank handle on the front, the engine can accumulate fuel until it has enough to start. Just maybe, the engine falls behind in fuel just after it starts, but, once past this point, everything goes fine. The air fuel senser sees plenty of fuel so doesn't increase it. With higher pressure, the engine will get more fuel at the start but the computer will pull it back once running.

This should be an interesting test. If you try it, let us know. It's just a non educated thought, as we say winging it.

If it doesn't idle good after it's running, it could be the throttle body idle air bypass valve sticking. If so, it needs removing and cleaning. I had to do that with mine but for a different reason. Mine wouldn't idle down as the valve was stuck too far open.

Lenny

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latch73 Explorer

latch73

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My 08 Trooper has had this starting problem since the day I purchased it new. My buddy bought an 08 Trooper the same day from the same dealer and also experienced the same problem. He turned up his idle but I felt it was a poor fix because its the same as giving it throttle. I tried upping the fuel psi, changed out fuel filters, and always let the fuel pump pressure up and sometimes turned the ignition on and off a few times to make sure it was pressured up. Nothing has ever worked. Now for problem #2 that I feel is part of problem #1 is if I ever kill the engine while lets say pushing snow with the plow you just as well walk away from the machine for 30 min. because it will not start at all. after about 30 min. it will fire right back up (with a little throttle) as if there was never a problem. If anybody figures this out I would be doing back flips. P.S. It doest matter if the engine is cold or warmed up I still have to give it a little throttle to start.

I forgot to mention that the machine idles fine once running.

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brostar Proficient

brostar

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Hey Lance, long time no see, good to see you back mate. I think what's going on can be narrowed down to the line from the fuel filter to regulator with the pump in the middle. What we do know is once the fuel reaches the fuel rail under good psi she's all systems go. Just thinking outside the box a bit, I've got a sneaky suspicion that the fuel pump and the fan share the same relay. They do in the Renegades so it could be some sort of draw on power or whatever. What happens every time you turn the ignition on..... the fuel pump pumps and the fan goes through it's cycle. Food for thought anyway.

Cheers Mike.

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Guest Lenny

Guest Lenny

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Hey Lance, long time no see, good to see you back mate. I think what's going on can be narrowed down to the line from the fuel filter to regulator with the pump in the middle. What we do know is once the fuel reaches the fuel rail under good psi she's all systems go. Just thinking outside the box a bit, I've got a sneaky suspicion that the fuel pump and the fan share the same relay. They do in the Renegades so it could be some sort of draw on power or whatever. What happens every time you turn the ignition on..... the fuel pump pumps and the fan goes through it's cycle. Food for thought anyway.

Cheers Mike.

Maybe try unpluging the fan next time it won't start.

Lenny

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fasted61 Rookie

fasted61

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Thanks guys for the ideas. I will give it a try. Its good to be back, I have been rebuilding my house all summer long and havn't had no time for anything else. No fun;-( Great to hear from you guys and I hope all is well.

The problem is in the throttle body the Iac valve is not cycling properly. You will have to go to a dealer and get a new throttle body they don't sell the valve seperately. This valve is on the bottom of the throttle body if you can find a replacement somewhere that would be great. so far I haven't been able to find one. Seen this problem several times. good luck.

Ed

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fasted61 Rookie

fasted61

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My 08 trooper is no longer "turn-key". it won't start unless i give it some gas. once it's running it idles down and acts perfectly normal. any ideas? on dirtbikes it's usually valves, but this ain't no dirtbike. the mighty trooper has about 700km on it and I've done nothing to it so far but an oil change. what should I try and in what order?

It is in the throttle body and they don't sell parts for it seperately. If you can't get one let me know I have them in stock seen this problem several times.

Fast Ed

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latch73 Explorer

latch73

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It is in the throttle body and they don't sell parts for it seperately. If you can't get one let me know I have them in stock seen this problem several times.

Fast Ed

Thanks fast Ed for the info. I am still finishing my house (trying to beat winter) but as soon as I get all caught up I will get in touch with you to discuss the problem in a little more detail. I have dealt with throttle bodys on trucks a little but am kind of in the dark on the part you described. I could use all the help I can get.

Thanks again

Lance

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Anylizer Enthusiast

Anylizer

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One other possibility is the air intake temp sensor. This is the small square sensor mounted on the side of the intake plenum. Un-plug it and remove it. Buy some throttle body cleaner from the parts house and spray off the little tip of this sensor. These will get piled up w/ dirt and can't take a good reading, causing the computer difficulties in determining how much fuel to deliver. Just a thought. A.

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latch73 Explorer

latch73

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One other possibility is the air intake temp sensor. This is the small square sensor mounted on the side of the intake plenum. Un-plug it and remove it. Buy some throttle body cleaner from the parts house and spray off the little tip of this sensor. These will get piled up w/ dirt and can't take a good reading, causing the computer difficulties in determining how much fuel to deliver. Just a thought. A.

Thanks Anylizer, I will give it a try.

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oceanjake Rookie

oceanjake

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turned out to be bad fuel. I ran some octane booster in the tank that was giving me trouble and changed the plugs but it still did the same thing. as soon as I added fresh fuel though the problem went away. starts fine now. good thing, because after a weekend of driving it like a baja car I've got some ideas for mods that I'd like to do instead of spending time chasing down a starting issue. thanks for all the feedback.

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