2000 Explorer with the 4.0 SOHC.
It starts fine under all conditions but when cold, like in the 30s or lower, it doesn't want to remain idling, yet no CEL comes on. New fuel pump. The throttle body is cleaned, as are the injectors. It runs super once it gets past the cold startup issue.
I was thinking a sensor is getting weak but not weak enough to set the CEL.
I have a 2000 Explorer W/4.0 SOHC engine. With summer nearly over and fall on the way, I need to figure out what is going on with my engine. This problem has been going on for the past 2 years. As the outdoor temperatures get cooler, the harder it is to start and keep the engine running. This starts happening around 65 ambient temperature, and gets worse as the temps drop. By 30, I can barely keep the engine running.
Odd thing is, all I have to do if the engine starts is, keep my foot on the pedal to keep the engine around 2000RPM, put it in gear and start driving. After about a mile or two, the engine runs normally, and will do so the rest of the day. So far I have cleaned the air flow sensor, replaced the IAC, replaced all the injector "O" rings, and cussed a lot. I smoke tested the engine and the only vacuum leak is a very small one at the EGR valve.
I have a 03 explorer 4.6 at cold start-up it wants to stall and it idles very bad just for maybe 5-6 seconds and then the idle picks up and it's fine. This only happens on cold start-ups, if I drive it and restart it's fine.
This started when I replaced the two front (up-stream) O2 sensors, I didn't need to change them just have 150,000+ mile and was trying to do something to get better mpg.
Do We should disconnect and reconnect the battery after replacing the O2 sensors on an 03? Reset the computer?
I have a 2000 Explorer, 4.0 V6 SOHC w/ 135K miles. All of a sudden it has an idle issue that's driving me nuts and the dealership can't fix. It has been in the shop 4 times for this problem so far.
It accelerates and cruises great, but when I come to a stoplight, the idle goes down to 900, then suddenly drops to 600 and idles rough. The "Check Engine" light is NOT lit. There is no hesitation, backfire or any other running problem. I have had plugs and wires, PCV valve, IAC valve and MAF sensor replaced. Technicians have checked for vacuum leaks and intake air gasket leaks and have found nothing.
I can "power brake" it and smooth it out some and even turning on the a/c or defroster boosts the idle and works a little. Shifting to neutral or park does not raise the idle like previous cars I owned. I only drive this car back and forth to work, about 1000 miles a month, and I'd like to make this Explorer last at least 200K miles. We just got a Ford Escape and I do not want another car payment right now!
My truck is a 1995 Explorer 4.0 150,000 miles, 5 speed.
Problem - Rough idle : when cold it's worse and will stall and choke a little. When warmed up it just has a rough idle but will not stall and stays at a pretty constant RPM. It's very tolerable when warmed up but still not right. It drives fine once off idle. No black smoke that I can see. Power may be just a little off but I would not bet on it. MPG seems about normal but haven't been on a long enough trip since problem started to tell for sure. Also longer than normal cranking on occasion.
Diagnostics so far : Fuel pressure is at 32 PSI, vacuum off regulator it's at 40 PSI. Not sure about key on only as I don't trust the autozone loaner gauges. You have to fiddle with it each time before it will read. Leak down after 30 minutes was about 4 PSI
No Check engine light ever. KOEO test shows no hard or on demand codes, I get the 111 pass. From CM I get 336 and 45.
336 is EGR related and my looks pretty rusty. I put a vacuum pump on it while running and the EGR held vacuum but had no effect at all on idle, I was expecting it to get worse as I opened the EGR so it may be stuck.
Searched high and low for vacuum leaks by ear, visual and with starting fluid all turned up nothing.
Actions so far : Replaced plugs, wires, IAC, and fuel filter. Cleaned MAF sensor and throttle body plus ran lucas fuel injector cleaner through it.
Next steps : I've got the EGR but it's so rusty I am sure I'll break the tube it bolts to plus I don't know it that alone will cause the rough idle. Will the DPFE sensor and/or EVR create a rough idle yet not turn on the CEL?
Thought about changing the fuel pump and/or regulator but the numbers are not terrible. Agree?
Thought about changing the intake gaskets but don't see any leaks.
I have a 2000 f150 lariat 5.4L 4x4 and when i start my truck up when it is usually below 40 my truck will idle around 300rpm and shake. It also makes popping noises in the exhaust. I am getting codes PO171 and 174 (running too lean in both banks) I have replaced my IAC, plugs, pcv valve, air temp sensor and MAF sensor and 02 sensors and nothing has changed. I have tried looking for for vacuum leaks using carb cleaner and starting fluid but i nothing has came up. I took it in to a mechanic and he suggested a bad intake manifold but i searched for a leak and found nothing.
View 14 RepliesMy wife's 2000 explorer with the ohv 4.0 has trouble starting when cold outside. No problem in summer. The engine turns over but never catches. Eventually, after 5-10 min, it will catch. Sometimes we have to trun the key all the way off, not just acc, to make it start. Had battery checked, and was on the "low" end for cold cranking amps, but the engine doesn't lag like a dead battery would. Last winter we replaced a gasket on the upper part of the engine thinking that it wasn't flexible enough when cold outside and was getting the air/fuel mixture wrong. No check engine light. I think that covers everything.
View 7 RepliesTruck is a 2003 Ranger EDGE 2wd auto w/140K miles (looks new) that was a one owner truck I recently bought. Came from Texas and is clean and was well maintained I got all service records up until I bought it in the fall last year. OK now the problems...
First...it has a high idle in the mornings when cold about 2000RPM. After it warms up it settles to about 800-900RPM but is VERY ROUGH to the point where it feels it will stall. I DID replace the spark plugs and the plug wires look newer and are not OEM. I DID remove and clean the IAC and it does not look very dirty but I did slightly clean it anyway.
When I did this I disconnected the battery for 20min. After I put it back together it ran smooth for about the first 10 minutes then same rough idle came back. I was told this truck has no EGR so that's not an issue. There are NO CODES and when I ran my pocket scanner nothing comes up either. Should I just go to NAPA and get a new IAC anyway? What else can I do?
My 2000 F-250 6.8L V10 has a choppy idle during the first 30 or so seconds after a cold start up in the morning then it smooths out and drives perfectly. If I were to place the truck in gear during the choppy idle, it would not die and throttle response would be fine.
I cleaned the MAF sensor and checked the PCV elbow for cracks (no cracks). It idles at about a 1000 rpm during a cold startup then drops to about 750 rpm according to the dash tachometer. The truck has 187,000 miles on it.
2000 Sierra 1500, 5.3L engine. When he starts it in the cold (below 40 degrees) at first hits 1000rpm, then immediately drops to 400-500rpm. The idle is rough and wants to die if he tries to drive it. However after 10-15 minutes and the eng warms up, its fine no problems at all. There is no codes, so the scanner we had didn't tell us anything. He had cleaned the TB and intake system with cleaner, no dice. He also disconnected the IAC while it was idling rough, that didn't change the way it ran at all. We would like to toubleshoot it more before we start throwing parts at it.
View 1 RepliesI have a 2006 Sorento, Idle at start, when cold is 2000 to 2200 rpms. When engine warms idle comes down to normal, 1000.
Replaced several vacuum lines, none showed any leaking but replaced to be sure.
Replaced the PCV valve, the old valve was not closing as it should and the replacement seemed to work some.
Replaced the Idle Air Control Valve and checked the old one for movement, moved an 1/8 of and inch from when cold to when hot. The new IAC did improve the problem some.
Tested throttle position sensor voltage, was good through range of motion (including being tapped on to simulate the running of the engine).
Sprayed carburetor cleaner around the engine when cold to look for a possible manifold leak, nothing noted.
Noticed one area that brings down the high idle when sprayed with carburetor cleaner is in the front top center, around a small plastic cylinder which is part of the intake system and has a vacuum manifold which changes the position of the cylinder with engine operation. I have two pictures of the area attached, the white cylinder is at end of paint stick, the vacuum manifold is to the right of the paint stick and yes there are vacuum lines not hooked up in the pictures. Hoping this is not a manifold leak.
Since having my engine replaced with a newer used engine block my idle speed when I first start it up or when it is cold is around 2000rpm which lasts for about 2-3 minutes until it begins to fall to the normal range of 1200-1400 and finally to 850 or 900rpm when warm. how can I fix this or is it okay to idle at 2000rpm for a couple of minutes? is it hurting anything?
View 3 Replies1992 camry 4 cylinder ... Since having my engine replaced with a used engine block my idle speed when I first start it up or when it is cold is around 2000rpm which lasts for about 2-3 minutes until it begins to fall to the normal range of 1200-1400 and finally to 850 or 900rpm when warm. how can I fix this or is it okay to idle at 2000rpm for a couple of minutes? is it hurting anything?
View 4 RepliesI replaced my engine that had 155,000 miles with a newer used one with about 30,000 miles. since the swap my gas mileage is down by one third or more. Everything else seems fine except that my cold start idle is up to 2000rpm's until it drops to normal within 3 minutes.
View 2 RepliesI have been picking at an engine vibration for more than a year.
I have a '00 Explorer 302 V8 installed in an '82 Volvo. This engine/transmission has not been abused and only has 15k miles since it left the Ford factory. It was found intact on a pallet in dry storage. Everything was there as from Ford from the fan to the transmission output bushing. There is an engine vibration beginning about 2000 rpm in PARK so the problem is not in the transmission or drive shaft.
Perfectly smooth at idle and until you approach the start of the vibration.
Replaced the viscous clutch mechanical fan with duel electric so it isn't an out of balance fan.
Pulled the serpentine belt this afternoon and still have the vibration. Might have been a little less and I did find a idler pulley that had a little rattle but the big vibration is still there with only the harmonic balancer through torque converter rotating.
Replaced the pulley. Nothing else changed from when Ford built it.
No OBD codes.
I have a 'mysterious' problem, that has stumped Ford mechanics and everyone else that I've taken it to; my 1991 Explorer will 'start' COLD,drive great as far as you want, but don't cut the key off!!! It will not start 'hot'!! You have to let it 'cool' all of the way back to cold!!! I have driven it all day long, making stops of up to three hours, and it never quit ONCE!! Used a lot of gas !!! We've changed all types of parts BUT nothing has worked... I put it in a 'Garage' to be looked at and all they did was 'blow' the engine up. They didn't fix my mysterious problem and now won't release the car, unless I pay them.. I got the tires off at night!!!
View 3 RepliesHow do you diagnose and repair a non working AC? The blowers still work, but no cold air blows.
View 4 RepliesHave a 91 Exp 4.0 v6, has a no start problem only in the cold weather. Last year, replaced coil pack, fuel pump, crank censor, this winter...same problem. Just will not start when it is cold. No codes, no ck engine. Checked it today...it has no spark. What could cause this? Fuel filter has also been changed. told him to ck crank position censor connector.
View 7 RepliesRear ac suction hose not cold, need diagnosing...
View 4 RepliesI have a 2005 Ford Explorer. Every time I start my car and it has been off for more than a couple of hours it makes a clicking noise that goes away as the car warms up. This happened once last fall and I took the car in for an oil change and the noise got much better then completely stopped. It just came back within the last couple of weeks, but I just had an oil change about a month ago. I checked the oil and it's not low. The noise was going away after less than a minute, but now it has started lasting more like five minutes (depending on how long it takes me to get on the freeway). By the time I arrive to work the car is quiet.
I keep reading that this probably has something to do with the lifters. Some people say that it might be engine sludge, etc and that a cleaning agent might be useful. Other people say that cleaning agents might be harmful. Someone told me I just need to get my lifters replaced. That's an expensive repair. I am just not sure what to do and I am afraid that just taking it to my mechanic will lead to getting new lifters whether completely necessary or not and I can't really afford it.
My 95 explorer heater only blows out cold air. I have topped off the antifreeze and just replaced the thermostat. The engine operating temperature is very cold, it won't even come up to the first mark. It is very cold here in Utah but I still can't imagine why the engine won't heat up.
View 9 Replies