I had my 97 4x4 4.6L to the dealer yesterday for the replacement of the intake manifold gaskets ( had a small leak at front of motor) and they unhooked the battery for the repair and now my truck does not idle at the same rpm's. Does the computer have to relearn this and how long does it take? It used to idle around 600 in drive and now it is roughly 500. Please advise.
Thanks...

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Dennis

 

Yep, it should idle better after about 50 miles.

 

Hi Dennis,

I agree, this shouldn't be anything to worry about, as within 50-100 miles, and many times sooner, the PCM will "re-learn" it's idle characteristics, and things will be back to normal.

Good luck!

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Mike Troyer
Performance Products, Inc.
National Distributor of Superchips
(540) 862-9515
Email: mtroyer@compuserve.com
Performance Products F150Online Superchip ordering system: F150Online Superchip Ordering System
First National F-150 Online Rally Event Organizer

 

I never measured the mileage, but mine generally takes several weeks to get back to normal after disconnecting the battery. Along with the varying idle, mine also stalls when I stop.

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'97 F-150 Lariat SuperCab 4X4

• White/Silver, 4.6L, Auto.
• Tinted Windows/Bedmat/Toolbox/Lund Bug Deflector/Ventvisors/Extra Horns
• 265/75/16 BFGoodrich on polished 16x8 AR-136's
• Cat-back Dual Exhaust (Straight pipes with big chrome tips)
• Polar Bear Grille Guard
• Cranked Torsion Bars for 1" Lift

 

Thanks for the feedback guys. The idle is still not back to normal. I have only driven about 21 miles since the repair.I thought it was going to quit today when puling into my driveway the rpm's fell below 500 but it kept running.
Thanks.

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Dennis

 

In all of my F-150s after disconnecting the battery (to install the Superchip), my idle was back to normal very quickly..50 miles max)...and I have never experienced a severe rough idle as you described (dropping below 500 rpm).

Keep driving it as much as possible..if it continues past a reasonable mileage (100 miles)..I would take it back in. Nothing major just yet....

Good luck!




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2000 F-150 XLT, 4x2, 5.4L Supercab, Superchip, Styleside, Black with silver two-tone, 3.55 rear, class III towing package with super engine cooling/Auxilary transmission cooling HD package, Heavy duty shocks, 4 wheel disk ABS, overhead console, sliding rear window, keyless entry, dark graphite interior, in dash CD, factory leather wrapped steering wheel, FORD bedliner, FORD black tubular cab steps, K&N air filter, mar-hyde rubberized undercoating, Modine climate filtration system, Bugflector II, Mobil 1 oil, build 7/2000