My 2004 Lincoln navigator is very rough at idle but runs smooth when I give it gas. Someone said my VCT may be stuck or bad. I looked at Youtube videos of VCT replacement but in all the videos the VCT's are up front in the valve covers. On the Navigator they aren't there. Where the heck they might be located?
View 2 RepliesMy 2001 V70 24T runs smooth when cold as it warms up it runs rough with delayed acceleration reaction ....
View 1 Repliesbasically it runs rough and makes noise when AC is on. While it may not be perfect when off, it certainly is quieter. Check engine light just came on.
View 5 RepliesThe car idles rough on cold mornings but runs fine. It will stall while idling but starts back easily. I am getting a 1131 and a 1151 code with my scanner along with 0300 and lean bank 1 codes. I started having these problems after I had to remove the upper intake to replace coil packs. I was getting egr code and had an egr port completely block off but cleaned that out and no longer get the egr codes. Spraying carb cleaner around the engine I get a very slight bump in rpm around a couple of the intake ports could that be my problem or should I look deeper?
View 5 RepliesBefore and after this speed it runs fine, so what could it be. The check engine light is now on all the time.
View 2 RepliesI have 2011 camry, which I drive at 30 to 40 mph some times its shaking. if I leave steering wheel it moving little left and right itself. (just little but going straight almost). what will be the problem is? current odometer 43K. no accident.
View 9 Replies2008 f150 5.4 30,000 miles the engine has top end noise on the right side and runs very rough no codes cam problem ?
View 4 RepliesI recently replaced the plugs cuz I had a rough idle all the time. During plug change when I discovered they had already been changed I found one that had a burned off electrode. Does this mean a lean condition exists?
After plug change it runs smoothly but only after 10 min warmup in our canadian winters. I can drive it when its not warm but seems to have less than full power and idles very badly after driving w/o proper warmup.
Next I changed fuel filter and checked fpdm, it was a little rusty but not bad so i just mounted it 1/4 off steel to prevent further rusting.
Since then I have installed a programmer [diablosport] but found no codes since i had battery disconnected for filter change. no new codes in last few weeks since.
So do I have a lean running cylinder causing this poor cold idle or a rich cylinder? It must be a clogged or dripping fuel injector right?
The title says it all. I have no CEL.
View 4 RepliesI had a no-start, replaced standpipes and dummy plugs. Passenger side dummy plug o-ring was shot, some of the others were pretty worn. Polished the spool valves and replaced injector seals. Confidently put it back together and fired it up. Idled sweet, bad low on power, especially at low rpm. FMP was bumping 45 so sent it to ED. It seemed a little better but not fixed. No visible smoke. Engine temp doesn't seem to make a big difference but it may be slightly better warm. Fuel consumption is hovering around 9mpg over the last 150mi. FPW stays around 800us warm/5.8ms cold. I think the low mpg is the excessive throttle needed to pull away from stops and climb hills.
I spent the day checking stuff and found the following.
The only codes are for a couple of glow plugs and a "key in ignition" error. No contribution codes. Monitored (with FORScan) the turbo (MAP, Baro, EBP, VGT), FICM, TPS, ICP/IPR(cold and warm) EGR, vRef, MAF vs TPS, and some other stuff like miss fire count (0), voltages everywhere I could look, and FPW. I saved a dozen files while checking this stuff and can be more specific on the numbers. Fresh fuel filters, No bubble in upper filter housing while cranking. Fuel pressure was 64 at idle, 61 when power braking or revving. No leaks on CAC or exhaust.
Possible culprits : Could I have done something to cause low power when I cleaned up the injectors? I'm sure the orientation of the spools and coils were right but I did "fudge" on the torque for the coil screws. If anything they may be a bit loose as I read a couple of times over tightening would cause problems. I am certain there is no play and a slight amount of load on them. I did clean the tips and bodies on a bench grinder with a gold colored wire wheel, light pressure and just a quick pass cleaned them up. Also, I ohmed the coils while they were on the bench. No shorts or opens except where there was supposed to be opens. All the coils were .5ohm except three read .6 and two read .8. Injector buzz sounds raggedy, not smooth. Any of that a issue?
Cold ICP/IPR is higher than it used to be, at 40 degrees I see 35% and 1300psi but ICP desired is 1250psi. I also noticed monitoring the TPS, rpm desired stays at 0. All three tracks measure position but one shows a constant .25v while the other two vary. Throttle position fault stays at "no" at all times. When it was a warm no-start (at the beginning of all this) I cranked it for maybe a minute total. ICP never went above 300psi so I knew why it wasn't starting. It was cranking normally in the beginning but part way through the second try RPM's went up suddenly as if it got easier to turn. When I started the truck the next day it limped home in this "low power" mode and even though it starts righ up now and idles smooth cold, the power issue remains. I plan to get a better set-up and recheck fuel pressure at WOT tomorrow.
2004 F250 V10, runs good until it warms up whether it's hot or cold outside. While on freeway, it really shakes while cruising, but of you get in the gas enough for a kick down, seems to be pretty smooth. I've changed the coils, and 9 plugs (one wouldn't budge, but the others I took out looked fine) to no effect. Where else should I look? Also, no CEL, and no codes, which seems odd as bad as it feels...
View 11 RepliesSo, my truck runs really rough when I am @1500 RPM and lightly feather the gas. I have replaced all coils and plugs. Used dielectric grease. Replaced air filter, replaced ICU, changed transmission fluid. The thing still "shudders" ... 2004 f250 5.4 ....
View 14 RepliesI have a 2006 Ford 150 with about 120,000 miles on it... For almost 9 months now I've had a really rough idle and I can't seem to get it to smooth out. I've tried new plugs, tune up, new fuel filter, higher octane gas, fuel injector cleaner, octane booster, cleaned my mass air flow sensor and nothing works... I've checked the trucks ECM for any codes but it comes up clean every time...
View 6 RepliesRecently bought a 96 4 cylinder 5speed 2wd ranger. 200xxx miles on it and its former owner had a young guy change spark plugs . Truck ran fine before, but after is when the rough running showed up.
A quick check of the plug wires and there locations looked correct and also tested the wires for spark with a timing light attached to them, checked shows all are firing.
Seems to smooth out a bit when rpm's are raised up, but still acts like not running smooth.
I swapped out plugs. Looks like they haven't been changed in a long time .Some of the straps are burnt and are shorter than they should be, but still runs rough, very little improvement .
Check vacuum lines for leaks/breaks and all looked good. removed line off brake booster and plugged, didn't matter.
It doesn't throw and check engine lights. It does smooth out some as the rpm's rise, but still not smooth .
I have a 2011 Santa Fe - I have noticed it is quite a rough ride. I guess I am used to the suspension in my Passat, but I still find it is not as smooth as it should be. I thought maybe giving it a bit of time would work, but so far at 25,000km it is still the same. Find it's a bit of a rough ride? Or should I look into it?
View 39 RepliesI have a 99 lesabre cold start rough idle but smooths out . Warm no start. Trouble codes P0171, P0300, P0336. Had plennum replaced 2 years ago but I'm seeing coolant around the base of the plennum so I'm going to have to do that again but I don't think that has anything to do with the warm no start.
View 14 RepliesThis problem has been getting worse over the last 2 years. When the car starts it idles fine at about 1000 RPM. As soon as it warms up, it starts to idle rough, between 500 and 750 RPM. It almost quits running. As soon as you give the car some gas it runs just fine. About 3 weeks ago I got a "Engine Lean" check engine light error. I reset the system and have not gotten the error again. Since then I have: changed the MAF cleaned the EGR (made sure it closes completely and ohm out the coils in the actuator) changed the O2 meter on the exhaust manifold cleaned out the throttle body Ohmed out the air idle controller. What I should check next. I was planning to check the fuel pressure in case it is a fuel system problem. It is a 1999 ....
View 5 RepliesHaving problem with 2016 Accent Sport (or other model) idling rough after smooth driving for about 20 or so minutes? It has started doing this about a month after being purchased. About 700 miles or so on it) When in stick mode it smooths out and purrs like a kitten, but back in automatic mode it idles rough, with Active Eco on and off. I have an appointment to take it in to the dealership 5/7, but I wanted to see what the cause was.
View 7 RepliesMy 2002 lincoln LS run rough after warm up. Check engine light code is EGR , replaced EGR.
View 2 RepliesI have a 2010 corolla S with around 15K miles. I'm not sure if this is really an issue but it has been bugging me for sometime. I have noticed that sometimes the engine / ride feels really smooth and feels as if the car just sails along. But most of the days the ride feels a little bit rough/grainy... I drive mostly in the city (around 80%) and live close to work (3miles one way). I do oil changes every 5 months... Would some kind of tuning be required? Or is this just normal?
View 7 RepliesMy truck runs very rough and lacks power when cold, even during the Texas summer. Once it warms-up, everything is fine. It's almost like turning on a light switch. If it's plugged in for a couple/few hours, it's smooth as soon as it starts. I'm assuming it likes the oil once it reaches a specific temperature. What my problem is?
View 14 Replies