Terminator low idle +/-750

[jeremyklatt1992]

Hey guys and girls. I have a 2004 Redfire Terminator and my idle rpm is about 750, but when I bought it in July of 2018 she had an idle of about 1000 rpm. Any idea what might cause this? I've already replaced the rear o2 sensors just not the front. I suspect it might be a vacuum leak. Help!!

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[BlksvtCobra01]

Could possibly be a dirty IAC. FYI the rear O2’s only show the cats are functioning properly. They don’t meter or see the air and fuel like the fronts.


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[jeremyklatt1992]

Could possibly be a dirty IAC. FYI the rear O2’s only show the cats are functioning properly. They don’t meter or see the air and fuel like the fronts.


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Where's that located? I've looked it up online and never found the exact spot.

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[BlksvtCobra01]

Where's that located? I've looked it up online and never found the exact spot.

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If I remember correctly on top of the intake plenum. Which is after the Throttle body before the supercharger. Have you tried to see if you have any codes? You could try cleaning the IAC to see if that helps.


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[BlksvtCobra01]

Also you could also try spraying some carb cleaner near vacuum lines to see if the idle changes. If it was a decent vacuum leak you would think the Service Engine Soon Light would illuminate.


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[SVT Hess]

Behind the throttle body on the supercharger plenum. I’d also check your PCV lines, particularly the one that’s on the back of the blower. I know when I first got my car that line was almost tore in half where it was kinked and old. I never got a code for it that I remember.

 

[jeremyklatt1992]

If I remember correctly on top of the intake plenum. Which is after the Throttle body before the supercharger. Have you tried to see if you have any codes? You could try cleaning the IAC to see if that helps.


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Never mind that.

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[01yellercobra]

Why was it idling at 1000rpm? Thats really high. 750 is stock.

 

[jeremyklatt1992]

Thanks, I'll look into this, and I'll just go get another one from AutoZone.

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[01yellercobra]

Don't just throw parts at it. Figure out what's wrong.

And generally a vacuum leak causes a high idle. Depending on where it is.

What are the specs on the car? Stock? Tuned? Any recent changes?

My guess is the throttle body was sticking before and causing your 1000rpm idle. It has since freed up allowing the car to idle where its supposed to.

 

[jeremyklatt1992]

Don't just throw parts at it. Figure out what's wrong.

And generally a vacuum leak causes a high idle. Depending on where it is.

What are the specs on the car? Stock? Tuned? Any recent changes?

My guess is the throttle body was sticking before and causing your 1000rpm idle. It has since freed up allowing the car to idle where its supposed to.

Right now the engine is stock, the only other mod is a k&n air filter, but every other day the codes p0171 and p0174 dtc's appear.

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[jeremyklatt1992]

Right now the engine is stock, the only other mod is a k&n air filter, but every other day the codes p0171 and p0174 dtc's appear.

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Also I put a borla stinger cat back exhaust.

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[01yellercobra]

Right now the engine is stock, the only other mod is a k&n air filter, but every other day the codes p0171 and p0174 dtc's appear.

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Check your intake tube. Make sure the clamps are tight. The 750rpm is normal for your car.

 

[jeremyklatt1992]

Check your intake tube. Make sure the clamps are tight. The 750rpm is normal for your car.

Clamps are tightened hand tight. What about the p0171 and p0174 dtc's?

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[jeremyklatt1992]

Also installed a Motorcraft fuel pump but the float didn't quite cooperate.

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[94slowbra1]

Those codes mean bank 1 and bank 2 are lean. Odds that both o2's went out at the same time are slim. Like said above. Air is getting in somewhere. Start looking at everything closely

 

[jeremyklatt1992]

Those codes mean bank 1 and bank 2 are lean. Odds that both o2's went out at the same time are slim. Like said above. Air is getting in somewhere. Start looking at everything closely

Ok

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[decipha]

it could very well be that the tune on the vehicle wasnt dialed in below 1k since thats where it was idling before and that could be causing your codes.

The best option to diagnose it correctly and see exactly whats wrong is a moates quarterhorse. Its a $250 realtime tuner that lets you see what the ecu sees. You can even custom tune it for free too.

Getting Started / EFIDynoTuning

 

[01yellercobra]

Check the PCV hose that runs under the back of the blower. The connector has been known to fall apart and cause vacuum leaks.

 

[Bdubbs]

Why was it idling at 1000rpm? Thats really high. 750 is stock.

Yup, I wouldn't want it to idle at 1k rpms.

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