[sasilvernail]

Recently bought a 09 Ranger 700. It will not rev above about 4500 rpm and I have done several thing to eliminate the problem. Compression check, New plugs, new belt, cleaned the mass air flow sensor and throttle body. Checked for restrictions in the exhaust and intake. Checked tps voltage and its good through the whole range. I have not checked fuel pressure yet but am going to this weekend. Ive taken the cover off the clutch and watched it while moving and it never fully shifts to the top of the primary sheave. I was thinking maybe the secondary clutch was hanging up but that wouldn't explain why the rpm's wont go above 4500 or so. It seems like its starving for fuel or air. By the way no codes stored. any advice? Thanks Steve

 

[commanderjjones]

You definitely need to verify fuel pressure. Bad fuel pumps are one of the most common engine problems on these machines.

Have you removed the belt to see if that made any difference? With the machine in neutral, I can't imagine that it would make a difference.....but it would be worth ruling out.

The reason it won't reach the top of the primary sheave is because the lack of RPM's.

 

[carnivore]

Jerrys right, check fuel pressure, and check the Tbap wiring. A broken Tbap wire can create all sorts of issues, but its more likely fuel pressure.
Did you check to see if the butterfly is opening all the way when you push the throttle down?

 

[POS POLARIS]

will the rpms max out when in neutral ?

If the sheave isn't getting full travel or if it's binding while going down the road, the engine won't be able to reach it's power band and you may never see anything more than 4700 rpm. It'd be like having your pickup stuck in high gear when it needs to be in the next gear down.

However, as the guys mentioned, if you've got low fuel pressure you won't hit the high rpms when driving at wide open throttle either. !

Fuel pressure's easy to check, and the clutch is too!

 

[Roadrunner]

Among other things mentioned Don't discount the throttle cable stretching. I know I have had to adjust mine several times over the years I have owned it.

 

[commanderjjones]

Among other things mentioned Don't discount the throttle cable stretching. I know I have had to adjust mine several times over the years I have owned it.

Yeap, I've had that happen too. It happens so gradually that you don't realize it. When you put on the new one and have max throttle again, it feels like you just added a turbo.

I think that's what Curt was getting at when he mentioned checking to make sure the butterfly is opening completely.

 

[carnivore]

Yeap, I've had that happen too. It happens so gradually that you don't realize it. When you put on the new one and have max throttle again, it feels like you just added a turbo.

I think that's what Curt was getting at when he mentioned checking to make sure the butterfly is opening completely.

Yes, I should have elaborated on that.

 

[Jungleman]

ositive: You would know if it was a fuel pressure issue as it would be missing and banging up a storm when the RPM quits climbing..

 

[pede58]

I just rebuilt my clutch, nothing was completely shot, new bearing, buttons and spring, after the reinstall gained 300rpm's.

 

[carnivore]

ositive: You would know if it was a fuel pressure issue as it would be missing and banging up a storm when the RPM quits climbing..

Not neccesarily. With the EFI it just tends to run flat.

 

[Jungleman]

" Polaris calls for 39psi +-3psi. This means that if your pressure is not 36-42 psi you have a fuel pump issue. This is very common on these vehicles. Typically when the fuel pump fails it creates a problem with 25+ mph acceleration. Usually popping and sputtering "

 

[sasilvernail]

Throttle plate opens all the way. It has a lot more travel on the pedal than I have power. Just makes that bogging noise like someone turned off the ignition but not hitting the rev limiter type. No backfiring at all though. I haven't put it in neutral and tried reving it up. Don't see that telling me much with no load on the motor though. It would be nice to have a fuel pressure gauge permanently mounted in the cab. Anyone see that before and where would you get a fitting to stay on the fuel rail. As far as the mass air flow sensor goes if any of those wires were to become loose and lose contact it would throw a code immediately, I would think. Whats a good replacement pump for that anyone know the number. Anyone have better luck with one over the other? Ill be able to test the pump Friday night and let you guys know what i find out. Thanks

 

[Jungleman]

Throttle plate opens all the way. It has a lot more travel on the pedal than I have power. Just makes that bogging noise like someone turned off the ignition but not hitting the rev limiter type. No backfiring at all though. I haven't put it in neutral and tried reving it up. Don't see that telling me much with no load on the motor though. It would be nice to have a fuel pressure gauge permanently mounted in the cab. Anyone see that before and where would you get a fitting to stay on the fuel rail. As far as the mass air flow sensor goes if any of those wires were to become loose and lose contact it would throw a code immediately, I would think. Whats a good replacement pump for that anyone know the number. Anyone have better luck with one over the other? Ill be able to test the pump Friday night and let you guys know what i find out. Thanks

"As far as the mass air flow sensor goes if any of those wires were to become loose and lose contact it would throw a code immediately, I would think"

You would think but that is not the case. I have seen completely rubbed through wire that never produced a code. Curt is correct on that and I would pull the plug on the TBAP and turn it over and thoroughly check the wires especially near the plug itself.

 

[sasilvernail]

Ok. I will have to check it out. Thanks

 

[commanderjjones]

Just to rule out another possibility, it wouldn't hurt to clean the sensor with some MAP sensor cleaner.....although more than 95% of TBAP issues are the wiring and not the sensor.

 

[POS POLARIS]

in my own experiences, I've never had a EFI ranger old or new that sputtered or backfired when the fuel pump was laying down. My 06 and 07 went through 4 combined fuel pumps in the time we had them, and every time they started losing fuel pressure you'd lose power (top end speed) and as they got worse they'd just bog when you gave them throttle. They might take off good for a second, and then fall off.

If you had a broken tps or t-bap wire, at least bad enough to set a code, the computer tells the injectors to go "full rich" which will make it run hard and fast, but won't idle at all. sounds like you've got a fuel delivery problem to me. My bets are on a bad fuel pump

 

[sasilvernail]

I did clean the whole intake from the air box in including the throttle body. Pulled the mass air flow sensor first and cleaned it as well with maf cleaner. I'm better the fuel pump falls on its face when I open it up I will see. Thanks for all the thoughts guys. Steve

 

[sasilvernail]

Anyone had better luck with a certain brand?

 

[POS POLARIS]

I've had best luck with Bosch (same as what's in your tank now). Worst luck with Airtex by far.

There's a list of replacement fuel pumps under the "important parts info for rangers " in the technical section. should save ya some bucks

 

[commanderjjones]

I've had best luck with Bosch (same as what's in your tank now).......

Ditto......hard to beat Bosch products.