Ford F-150 - 1997-2003 :: High Idle In Park / Neutral And Shifting
Apr 11, 2017
I have a '98 F150 4.2l with 230k miles on it. A couple of days ago when starting, I noticed that the engine kept racing instead of idling down like it normally does and the weather here in Arkansas has approached the 80 degree mark. The engine also doesn't idle down when shifting (I have a manual tranny). Where to start? I don't have any codes stored other than two for bank 1 and bank 2 running lean but they popped up many miles ago. I'm thinking either a vacuum leak or throttle control. I checked the operation of the cable and the throttle valve and they appear to be fine. Maybe the idle air control?
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I'm trying to find out what I need to check or replace to get my 2000 Excursion to idle at normal rpm's in park and neutral.
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I replaced the thermostat in my 2000 3.1L Grand Prix SE yesterday. I had to remove the throttle body to get access to it. After putting it all back together, my car now idles around 3000rpm in Park or Neutral. It drops to around 2k when driving which is still a little high. I can definitely feel it taking off faster and it seems to buck a little bit here and there while driving. I did hear a loud hissing sound when I first started it up right around the throttle body area. I don't hear the hissing sound anymore, though. It justs sounds like it's running a lot harder. So my question is, would a leak around the throttle body (I did not use a new gasket and it's possible that the gasket wasn't properly seated) cause these symptoms? On the plus side, my car seemed to heat up super fast!
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My 1998 Ford Explorer XLT v6 with about 233,000 miles on it has a bit of a problem. Infrequently, when I shift into reverse from park or neutral the engine dies. It restarts without issue. There are no strange noises or smells when this happens.
The transmission was rebuilt 10,000 miles ago by a reputable mechanic. Almost all of the 230k+ miles are highway miles. Each trip around 40 miles.
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"95, 2.3L, automatic. Stalls for a couple of seconds and nearly dies when shifting from drive to neutral or from drive to park. Doesn't do it when cold at high idle or when AC is on. It catches back up and idles fine but nearly dies when coming out of drive. Installed a new idle air control valve but no change.
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2001 f150 supercrew 5.4 triton... Recently did a tune up plugs,coil packs,filters,belt the whole 9 yards. The truck starts fine accelerates great and cruises down the road great without missing a beat.
But every now and then when you stop at a light or park it begins to idle down to the point where it almost stalls. When it does this i usually stab the throttle and it revs right up without missing a beat and idles fine for a a while then same thing all over again.
Could this be the idle air control? Seems like something simple due to the fact it runs down the road and accelerates like a big dog.
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1991, F-250, automatic, 150,000 miles, two tanks. Used mostly for towing an RV plus some pleasure. Not in daily use. A month ago I parked it and a few days later cranked it up and found it wouldn't run over thirty MPH. There was some high pitched backfire in the engine compartment and the trans. wouldn't shift. I parked it and the next day it wouldn't start. When I turned the key on the fuel pumps (either tank) ran continuously. Towed to a garage (I am not a Mechanic). They have replaced the fuel pressure control, checked all pressures and it still won't run right. The problem is intermittent. My tranny man said the trans was good. My mechanics don't know what to do. I bought it in 1998.
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My automatic 2007 Nissan Altima has developed an intermittent problem when I go to shift it into park it won't shift down past neutral. I can't physically move the gear shift past neutral and can't take my key out of the car. If I wait awhile or drive off somewhere else it will later allow me to shift normally again and won't happen for awhile. It has happened maybe 8-9 times but I worry it will get worse or break the transmission. I've taken it to a mechanic and they looked at the transmission and didn't see a problem but sense they couldn't recreate the issue they couldn't fix it.
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OK I know it's not a 6.0 or even a diesel. I had my Ford Expedition(2005) in to have rear main bearing seal, transfer case input shaft seal, etc, which included dropping the transmission. When we picked it up I noticed that it now shakes when in Park and Neutral when at idle. The shake cycles every 2 seconds or so, shakes for 2 seconds, smooths out for 2 seconds, shakes for 2 seconds, etc. There are no codes thrown, it runs smooth in gear running at interstate speeds and in town driving. They put the scanner on it, unbolted the transmission and re torqued them, and a bunch of other stuff. They are lost. I though maybe the torque converter wasn't in balance or something but they ruled that out.
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My 2001 Hyundai Santa Fe has recently started idling very high when put in park or neutral. While in drive the engine idles above 1K and you need to keep your foot on the brake to keep from moving forward. If you shut down the vehicle while idling high, the car will not start right away. It needs to cool down for 10 -15 minutes before restarting. It will run fine for awhile but will go back to revving up again.
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I'm having trouble diagnosing a high RPM in park and neutral on my 2004 Santa FE 4WD 2.7L. Idle's great in drive and reverse. Occasionally when I start the car up it will shoot up to 3000 RPM until I shift into drive or reverse with a heavy thunk. Then it drives fine. When I shift back into park when I'm done driving, it will shoot back up. To avoid this, I just shut the car off in drive and then shift to park.The weird thing is, sometimes it doesn't happen at all. Sometimes it starts right up and shuts down with perfect idle. However, once I give it some throttle in park in these instances, the idle will jump back and forth between 1500 and 2000 and won't die back down to 800 where it should be until I shift into drive or reverse. Not sure what's going on.
I've replaced the idle air control valve, purge valve solenoid, and camshaft position sensor, but to no avail. I also replaced the throttle position sensor a few weeks ago, but that didn't seem to do anything, so I took it back. I'm wondering if I maybe didn't do the correct installation procedure. I still have the old grey TPS for what it's worth. Should I change this? I've also played with the tension in the throttle cable, but I don't really know how to get it exactly within specifications. I definitely removed some slack. I just checked for vacuum leaks using the cigar method with a hose from the PCV valve with the throttle body sealed with saran wrap, but I couldn't find anything. My method was shoddy, and I don't really know what I'm doing, so I wouldn't rule out a vacuum leak by any means.
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So, yesterday I noticed the idle was higher than normal. In drive I'm at 950 to 1000 rpm and in park it's about 1150 to 1200. It's kind of like a cold start but never backs off and does this when things are warmed up also.
I replaced the IAC Valve about a month ago cause I got tired or cleaning it. The condition was a low idle and fluctuation when I came to a stop.
To test for the new conditions I have been reading that if I pull the plug on the IAC that the idle should drop if it's working?
If there is no drop in RPM then it could be the TPS? 1999 5.4....
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1999 F-150 5.4L. I just removed the clutch fan and installed two electric fans about two weeks ago. The same evening, I took a short drive and noticed the idle was way higher than it normally is. Its idling about 800 to 900 RPM. Now, the weird part.....Startup is normal, as in the idle jumps up for the warmup, then drops to the normal 600 to 700 range. after a short drive, the idle is high and noticeable at a stop.
Sometimes, if I let the truck idle, after about 10 mins or so the idle will slowly start creeping up a little at a time till it hits about 900 or so and will level off. I have tried the IAC, I have tried disconnecting the battery and letting the PCM reboot, I have checked ALL my vacuum lines, I have checked my TPS sensor and voltages, checked my MAF sensor and voltages, fuel pressures, everything I could think of...
I hooked up my scanner (Auto X-Ray 6000) and checked all my running data, nothing really sticks out to me as outta whack. No codes set..
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I've got a 2003 ford f-150 with a 4.6l 150000 miles. when it is started the rpms are at 2000 for about a min. and a half then it drops to normal when its started cold. when started at operating temp. The rpms are at 2000 for about 30 to 45 sec then drop to normal. The iac, upper and lower intake gaskets, intake run controller valve, dfbe, low intake and shield, coolant temp. sensor, intake air temp. sensor, egr, egr regulator valve, maf, ecm have all been swapped out no vacuum leaks all line in good condition tps voltage reading of 0.84v...
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I will try to keep this short. Picked up a 2000 f-150 4.2 for my nephews first truck last night. Bought it blind against my better judgement, but the price was right. Got it home, odometer didn't work, fixed the solder joint and was happy it only had 132k on it. Heater core was plugged solid. Got it flushed and at least now its has luke warm heat until I have time for a full coolant flush and new core.
Next on my list is the high idle and engine lights. Its idles around 1300-1700, cold or hot sometimes it drops down. I only have a cheap scanner, but I have 2 codes. PO171 and PO174. Where should I start with diagnosing this? I would assume vacuum leak. Any common spots to check on these?
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corrected vaccum leak. Still high idle and obd2 code 1506???
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So my F150 (with 4r70w) has a weird issue. If I jump on it (only briefly) and then drive normally it gets stuck in a high idle/late shift mode. Sometimes it won't even shift until 3500 - 4000 RPM. If I stop and restart it will usually go back to normal (depending on how warm the tranny is, the warmer it is, the less likely to fix on restart). Now I understand that if you give it a lot of gas it will shift later, but like I said, it get's stuck in this mode even if I have a light foot after. The really weird thing is that it does this after cruising on the highway for a while. Also, the OD light does not flash.
As I'm writing this, I just realized that a common thing is warm tranny fluid. I'm not sure if it's the tranny because the high idle and the fact that it will shift fine if babied. There are no codes.
Here's what I've done: Flushed tranny fluid and filter (full flush, not just the little bit with the filter change), replaced TPS, replaced PCV, replaced IAC valve, replaced a few vac lines, and cleaned entire throttle body (including EGR valve).
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My car makes a high chatter sound when I shift from neutral to either first or reverse but no other time. what does that mean? should I stop driving it until I can get it looked at? it's not slipping or grinding at all, just makes a noise as I let the clutch out and engage the gear.
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High mileage 1999 4.6 4wd 5 spd: Needed to replace the rear ABS sensor and decided to clean the throttle body too while the battery was unplugged. Cleaned it around the butterfly and not much else. Truck idled at 750 BEFORE cleaning the TB. Now it fluctuates between 820 and 950 rpms. Also tends to stay at a higher rpm after pushing in the clutch and taking it out of gear.
Did a thorough check for vacuum leaks, nothing. After research, I cleaned the IAC and re installed (battery was disconnected then too). No improvement. Unplugged the IAC while running- ZERO change in idle. Installed new IAC, no change whatsoever. Unplugged NEW IAC, no change whatsoever. Is there an issue with the PCM needing time to fully re learn? Am I missing something.
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My trucks symptoms include a illuminated service engine soon light, sometimes a high rpm idle, and sometimes a rough erratic idle. When a scan was done it indicated the oxygen sensor was defective. The issue is: which specific one (there are multiple oxygen sensors) or how could I check or determine the faulty one for sure. I am trying to economize and replace only the bad one myself if possible. I own a good multimeter, can it determine the bad one? 1999 F-150 4.2 Litre V6 oxygen sensor dillemna....
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My 1997 3500 shifts down normally through all gears but when I put it into park the lever on the trans stops at neutral I can then click the lever forward to rev.and park.
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