I have a '93 Thunderbird 3.8 v6, auto trans, that was a great running car until I had the water pump replaced. So, I got the pump replaced and then 1 day later the car started to idle around 2500 rpm. It would hit about 45mph without even giving it any gas. I swapped out the mass air flow sensor for a new one. This brought the idle down a little bit. A month later, it shot back up.
View 2 RepliesI'm working on a 93 thunderbird with a 3.8 in it and no check engine lights are on.The engine races at about 2500 rpm in neutral, I changed out the TPS but the idle still was way too high.
My first thought was a vacuum leak and I did find one hose that was rotted away. I then tested for vacuum leaksby spraying some brake cleaner around the intake and all the lines and fittings, but the engine stayed at a constant rpm.
My next guess is the Throttle Air bypass valve.
Ranger often wants to idle at 2,500 to 3,000 rpm. I'm glad its got a clutch! This is a long term intermittent problem that is getting worse. I have replaced the the IAC twice. I have unplugged the IAC when the engine is in high idle and the engine idles normally. But, starting the car with the IAC unplugged makes car run rough. That makes me think the IAC is not getting the right voltage input from the pmc (eec). Mine is a 2002 with the 3.0 engine. Throttle plate seems to be closed.
What sense inputs does PMC use to determine idle air position? Also replaced TPS sometime ago but that didn't work either. Sometimes turning off the a/c will knock the idle back to normal but not always. Turning the car off completely usually resets idle. But the high idle comes right back after accelerating. Drove the car today and idle would stick and stay high when clutch pushed in coming to a light. However. as the car slowed to a stop the idle would come down when rolling 1-2 mph. ??
I have a 1997 Ranger with a 3.0 v6 with a super high idle.
It idles at 2500 RPM when the IAC is plugged and a steady 1100 when unplugged. I have replaced the IAC twice now (dropped the first replacement. long story) and and have also checked for vac leaks with no results.
After about 2-3 minutes of idling at 2500 on a cold start it will drop down to 1100 (same as when IAC is unplugged), but after a 10 minutes or so drive it will idle steady at 2500 with minimal if any dropping in RPMs. This is driving me crazy not only because it sounds horrible but also because of the fact it's burning through fuel like it's going out of style.
I have checked the MAF sensor and it looks brand new (not the original owner) along with the O2 sensor. I have been meaning to check the TPS voltage to see if it's working correctly but without a working multi-meter it's making it difficult to do anything.
I'm at a loss with this right now and because of all the previous repairs i have done to it and the others that still need to be done i don't have the biggest budget to fix this problem nor the money the truck is using in gas.
I have a 2003 Malibu with 57000 on it. It recently started to high idle at roughly 2500 RPM. Could the throttle position sensor have gone bad? It will do this after it warms up.
View 3 RepliesHad a first-time issue with my car today. Background, 2010 II bought in June, just short of 15K miles, never had any kind of mechanical issue.
While en route to work this morning, I was about halfway into my 15 minute drive to work, when I noticed my engine was idling very high, I would guess 2500 rpms. It started doing it while I was driving around 35 MPH, then continued doing it while I stopped at a traffic light, and continued when I continued driving to a speed around 50 MPH. The high idle while stopped was not transferred to the wheels, so it was not a safety issue as it would be in other cars.
When I got back up to 50, curious to try something, I hit the ECO mode button and the car returned to normal. I took ECO back off and the car was still fine. I had no further problems.
I would point out that this morning was about the coldest temp that the car has experienced. Outside temp ranged from 7 to 10 degrees.
My 2003 T-Bird (52,000 miles, original owner and only driver) has a fan coming on occasionally (in front) while I am driving. No warning lights. It goes off when I shut off the engine but then I get a high pitched whining sound (in front) that shuts off after a few minutes. I took into the dealer and they checked out my radiator level (full) but found a pinhole leak in the radiator hose. "The engine is not overheating, not to worry, fan is electronic and is normal". I don't think its normal since this is the first time its doing this after 9 years. Could this be the same problem as Elaina is having: An evaporative emissions pump sticky valve or leak in this system?
View 5 Replies1993 Geo Prizm, manual transmission: Intermittent failure to start over a two year period, gradually becoming more frequent. The engine turns over every time the key is turned to start the engine, i.e. the starter motor/battery/battery connections work flawlessly. Once started the engine runs flawlessly without misses or shut downs. The only possible problem may be the engine idle speed that seems at times to be too high even after the engine is warmed up. Without predictability, the engine may fail to start when the key is turned.
Remember the engine still turns over normally. It just does not fire up. Two options exist for my predicament. That which is resorted to the most because of the speed of recovery: step out of the vehicle and push start the car by popping the clutch. The other alternative which I have been forced to utilize before because of the physical impossibility of push starting (i.e. if I had been able to push, I would have popped the clutch to start) at the time has been to wait for a protracted period and re-attempt to key start the car. This has been successful a couple of times.
Engine is a 69 390, fresh rebuild by the PO... Aluminum intake manifold and new Edelbrock 4bbl Drop in Crane ignition.
Runs great... Except when its warm out, or even on cold days when its warmed up after a substantial drive..
AT that point here is what happens: No issue until I shut it off then it diesels badly, THEN.. When I restart it will not idle, dies.. If I keep my foot on the accelerator it will keep running, but not well.. If I let it run for a good while, 5-10 mins, it smooths out... Consistently acts like this .. Again.. Not when the engine is cold, and not on a cold day until it really warms up..
I suspected a vacuum leak? Replaced any suspicious vac tubing.. Cant get to the AT modulator easily, have not checked it yet?? Also suspect the intake manifold??
i have a 1993 3/4 ton pickup 5.7 and it just started to shift rough it has to get up to 4000 rpm to shift from 1-2 and 2-3 someone told me to change the filter another person told me to check the vacume line i went under truck and found a vent tube out the side not sure what to do
View 1 RepliesA high pitched squeal appears to come from the front of the a/c compressor whenever the clutch engages. When the clutch disengages the compressor stops spinning, and the squeal stops. I can watch and listen to this as the system cycles with the a/c switched on. If I turn off the a/c, no squeal. I'm guessing the bearings in the compressor are going out. However, the system still cools normally, so apparently no gas has leaked out.
Does this imply the compressor must be replaced, or could injection of some oil into the system possibly fix it...?
This car only has 73,000 miles on it. I've owned 2 other TB's and a couple classic Mustangs with much higher miles and never seen an a/c compressor bearings fail.
Mechanics say they don’t know what wrong… I had some transmission work done on my truck – mostly an leak and replacing the harness – and ever since then after it rains or if we have a heavy dew my truck does the following:
Driving from O to 49 miles an hour truck is fine, as soon as I hit 50 the truck starts surging and you can see the tachometer jumping from 2000 RPM to 2500 RPMs. I drive around 17 miles to work where my truck will sit for seven hours. On the way home the truck is fine. I find this to be more of a problem when the truck has sat for a day or two over the weekend without driving it. Sometimes the “check engine” light will come on, sometimes not.
I have taken it to two different places and neither one says they can find anything wrong with the truck. I have driven this truck for over 11 years and know it very well. There is something wrong, but what? 1993 Chevy Silverado 3500 Diesel....
I have a 1998 Ford Escort which I drove about 450 miles in frigid weather over about 8 hours in mid January. After arriving at my neighborhood and getting off the expressway, I couldn't get the idle on the car (manual transmission) to go below 2500rpm's. Further, upon taking off, the car was trying to stall, and I was forced to feather the clutch through town driving and keep the throttle up so it wouldn't stall, even with the clutch in. The weather at the time was about -7 degrees (f). The next day the weather continued, and thee car would start, jump to the same idle for 10 seconds, then drop suddenly to 500rpm, then stall out. I wrote the car off, cleaned it out over the next week, and then I tried to run the radio while doing so last weekend. I got the car to start, and run normally. I think it may be a computer issue, but it may also be the temperatures. The car has 207,000 miles on it.
View 3 RepliesI bought a 99 f150 lariat 4x4 with the 5.4 from a guy who said that it needed an oil pump. He said it lost pressure coming into work, he turned it off and coasted in. I towed it home and replaced the battery and bought a new oil pressure sending unit just to be sure it wasn't that.
Those things are so hard to get to. Finally I got an oxygen sensor tool on it and it was only hand tight. Rather than take it off I just tightened it up and started the truck. The dash guage read normal but the truck was idling so badly. Steady at about 1000 rpm and tooth rattling. 1500 with the foot on the pedal it evens out but still rough. Not sure if this was a good idea but I took it around the block. No power under 2500 rpm. Barely moving even. Just felt like there was no throttle response at all and again very rough.
Got it home and parked it. Now I'm wondering what to do to fix the Idle and power problem. Where to start would be great. And input on the oil pressure sending unit too. I suppose I'll have to get under there and replace it at some point anyways.
Anytime I run the RPM passed 2300-2500 I get this high frequency squeal. I don't seam to lose any performance, but very annoying. Is this the turbo having troubles. It's directly related to the RPM'S. Other that that, the truck runs great....
View 14 RepliesI got an old 1989 F-150, manual, in-line 6 engine, with an 8-foot bed. I use it for hauling landscaping equipment, as i am starting a business. i will likely start hauling trailers with it this summer, but I also just want the engine to give me more power.
What are some things I could do to up the HP, or a better truck in general. I'm not looking to make it into a 350Hp monster, just get a little more out of it. What can I replace or add that would do this?
First, the idle dies on me when i put it in neutral, or gets stuck at 2500rpms. is this a vacuum leak, or the idle-air control valve?
I bought a 2006 F-350 4WD Lariat SRW with a little over 200,000 miles on it. The truck seems to run perfectly, except when pulling a load (9,000-10,000 lbs) down the interstate/highway. Sometimes, when pulling above 65-70 mph for an extended period of time (45 minutes to an hour) the truck will all of a sudden idle down and won't get above 2300-2500 RPMs (even if you put it in neutral and floor it). It's not enough to shut it down, but it won't let the truck accelerate as fast as normal. Killing the truck and cranking it back makes it go back to running normal for a little while, but the periods of it acting up get shorter after each killing and restarting. I took it to the Ford place while it was acting up, and they thought it was a turbo problem. They cleaned the turbo and said everything looked fine, but the same problem arose after leaving the shop. They've been stumped at 3 different Ford shops, but one said there's a 95% chance a new turbo would fix the problem. What might be wrong?
View 8 RepliesTruck: Ranger
Year: 1990
Engine: 2.3 Lima
Trans: 5 Speed Manual
Miles: 83,445
Recently Replaced:Oil Pressure Switch
Oil Pan Gasket
Crank Position Sensor
Spark Plugs
Plug Wireset
Ignition Control Module
Driver Side Coilpack
After I got done with all of this crap on my Ranger, I noticed that it was driving great! But...today I was on my way to school and BAM! My engine idle started hitting (presumably because I do not have a tachometer) about 3000RPM and lowering down to about 2500RPM and from there, every time I am not in gear it decided to fluctuate between 2500RPM and 3000RPM. Crazy style too.
Now, I got to school, and getting closer to it at a stop light the truck basically died. It was almost at 100'ish RPM. I gave it gas, and BAM. I hear a continuous hissing noise from under my hood. Haven't diagnosed it fully yet because I just got home and its 12AM.
Now, every time I stop at a light or in traffic or whatever it may be, I have to give it gas every other second, like a small push on the pedal, to make sure the truck doesn't die. Also, every time I am out of gear and my RPM's are at an 'idle' state, I get continuous hissing from somewhere, I get no power loss or anything, just really weird idle RPM's and hissing when my foot is not on the gas basically. It is strange. I think It is some sort of Vacuum leak but I am not sure.
To get a better picture of the 'hissing' noise, it is the same hissing as you would hear when letting the air out of a tire. That is the best way I could describe it.
I have a 2001 Santa Fe that I am getting road ready for my son, The engine has recently started idling very high, 2500 RPM at startup. I disconnected the IAC servo and it drops right down to about 900 RPM. I replaced the IAC with a brand new one and it does the same thing at startup, 2500+ RPM. Checked vacuum hoses / tubes. I replaced 2 crack / dry vacuum hoses. Same problem for a while, then idle went down to about 1250. Started to drive it, test ride. while accelerating, seems OK as soon as I take my foot off of the gas, idle goes to 2500 - 3000 RPM until I apply brakes and then it drops back down to 1000 or so. (SOUNDS LIKE A VACUUM LEAK PROBLEM. I CANT FIND IT, IVE BEEN THROUGH 2 CANS OF CARB CLEANER AND HOURS OF REPLACING ALL VACUUM HOSES.)
View 2 RepliesI have a 93 Ford explorer, when I start off at a high speed I hear a rattle noise, when I'm going up a hill it starts to make the rattling noise and the check engine light comes on, also when going up the hill when this happens I'm going around 110 and it kinda like powers out slows down on its own to 80, when I have the pedal down all the way you can hear I think over drive kicks in the rattling stops but no power and when I release the pedal a little the rattling noise comes back. Also the RPM is at 4 when i have the pedal all the way down.
View 1 Replies2002 HD 2500 6.0 - Pulled into Wal-Mart, everything was fine. Came out 20 min later, started right up, but felt like it stalled, it was actually still running, (barely). Shut off, restarted, same. Used pedal to bump idle up to normal 500-600 RPM, it was smooth, no misfire or roughness. Drove home, approx 5 miles, and had to keep the idle up at every stop.
Could be IAC? How can I test it/What checks can I do in the darkness, by flashlight? No garage, but I do have tools, and basic test light, dmm, etc. First thought was fuel pressure, but it runs fine going down the road.