Ford F-150 - 1997-2003 :: RPMs Drop To 330 While Braking
May 29, 2013
Two weeks ago Sun, truck ran fine, however Mon morning all hell broke loose. Truck was running very sluggish and stalling while coming to a stop. My first thought was tune up. I replaced the plugs and wires. During this I found that i could not get a socket around the ever loved driver side rear plug so i was only able to replace 7 plugs however in that process i managed to break the metal coolant tube that runs to the heater core.
Aday later replaced the entire intake manifold,egr valve, egr tube, IAC valve, both coil packs, fuel filter, tranny fluid and filter. During the removal of the intake i looked at the rear spark plug and found that a screw had been wedged into the hole breaking the plug and got it changed now it is all back together and the truck runs amazing however did not solve the low rpms during stopping. ive replace the above and checked fuel pressure which is good.
I have a TPS sensor just haven't installed it yet not sure if it is related to the issue. Tranny guy says it may be a bad solenoid or TC however last night I reset the PCM and drove it it ran flawless. this morning the problem returned which leads me to believe its not the tranny. ok one last kicker that 6 experts have failed to answer when i manually put the truck into 2nd gear the engine dies! no studder no fighting just quits.
Truck is a 98 F150 4.6 V8 186,000 miles i have yet to
1) change TPS.
2) clean throttle body.
3) clean MAF sensor. n
Not sure if any of this has an effect on the issue. There is only a EGR insufficient Air flow code..
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IAC
MAF
Plugs & wires
Coil pack
intake manifold gaskets
fuel system cleaner
fuel filter
air filter
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Recently I have noticed that when on a tune other than stock I am getting a surge at idle - my RPMs drop to around 621-630 then shoot back up to 660-675. On my stock tune my RPMs stay around 640-667 and don't cause the surge (felt as a shimmy so to speak). Is there anything else that causes a similar symptom? I attribute it to tuning due to it only happening when running anything but stock but could be wrong.
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I have a 2003 GMC Envoy I6 4.2L. When driving above 50 after vehicle has warmed up it will drop rpm's by 300-500 and they go back up. This happens for several minutes at a time. It did it for over 20 minutes last night while driving home. I thoroughly cleaned the throttle body this morning (removed to clean) because in my researching for the solution it seemed that was the answer. Also left battery disconnected the entire time to allow computer to reset itself for clean TB. Took it for test drive and after about 10 minutes of driving it started doing the same thing. Took it to autozone to see if maybe they could pull a code even though there is no SEL on at the moment, but nothing came up. I am dreading if it's in drivetrain, i have only had the vehicle for about a week and a half. Bought it used from a private seller and it drove home fine the day i bought it and a couple days after, but now it's gotten worse than when it first started.
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I have a 2003 Camry 3.0l v6. Stalls at lights random.
Currently the car stalls at stops but this doesn't happen all the time it can go a month in between the problem occurring its very random. While sitting at a light the rpms drop and then it revs up and cycles like that for quite a while. This will also occur while cruising at a low speed while I'm just coasting the rpms will go up and down. I can compensate while stopped by power braking and keeping it at its normal idling rpm. I have no check engine lights and can't seem to determine what would be causing this issue.
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IOur 2003 suburban often gets a "reduced engine power" displayed by the computer and the RPMs drop to below 1,000. The vehicle will not accelerate and will not go above 1,200 RPMs no matter how much gas it is getting. Flooring the gas pedal has absolutely no effect and the truck continues on its merry way at about 20 miles per hour.
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Never get a check engine light, and no codes from the computer when I had it checked. Could this be the vapor management valve turning on?
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I have a 1997 F-150, 2 wheel drive, 4.6L truck. Recently the transmission got to where it didn't shift properly. Then it got to where, after driving it about 10 to 15 miles the transmission would drop out of gear with the transmission selector in drive.
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What is wrong. The transmission shifts fine, the truck runs fine, but after 10 to 15 miles the transmission quits working.
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It just doesn't end lately. I've noticed over the last several months, when it rains and I start the engine I would hear an underhood squealing noise. Like a belt or pulley. After the engine warmed up a bit, and the engine bay dried out, the squeal would go away. After a rain about a month back, I opened the hood to listen but wasn't able to locate the exact source of the squeal. Never gave it any more thought.....until this evening. I was driving in our New England Nor'easter in 4 whl drive mode with the wipers on HI, the defroster and blower on HI, and the headlamps and dash lights illuminated, when suddenly the dash lights dimmed about 40%, the blower slowed down about the same, and the wiper speed dropped as well from HI to about low speed. This was shortly followed by an underhood squeal which sounded a lot like the one I've experienced recently. After about 20 secs, the squeal would disappear and the power would quickly return to all accessories! This happened about 4 or 5 times and I returned home and parked it as I did not want to be stranded during the blizzard with a dead truck. The battery voltage gauge needle on the dash never seemed to move so I'm a bit stumped.
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