Ford F-150 - 1997-2003 :: Air Sucking Noise Heard Mostly At Idle?
Sep 3, 2014
I have a 97 F150 4.6l, and this morning I noticed a noise that sounds like air sucking in. You hear it mostly at idle, the truck is idling where it typically does, but occasionally it will "bog" down a bit for a couple seconds, but then keeps running normally. Anyways the noise seems to be coming from the lower drivers side. Under the dash/steering column, and around the front drivers wheel well. Could it be a vacuum leak? The truck does have lean codes. I'm not sure if this is relevant but if I'm at a stop and I release the brake to accelerate the noise will stop for a split second once the pedal is released....
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I have a slight squeak noise that is only heard at idle some of the time. I replaced the belt, idler, and tensioner when I noticed just spinning the alternator gives the sound I'm hearing. Is it something I should be concerned about? It isn't noisy all the time, only sometimes. I don't want to fix what isn't broken, but I don't want it to leave me stranded one day either.
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About a week ago my 1997 F150 4.6L 2WD starting a ticking noise. I had used high mileage full synthetic Mobil 1 and a Motorcraft oil filter for the previous oil change and yesterday had another oil change using regular Mobil 1 synthetic and a Motorcraft oil filter. Had never used high mileage oil before.
Since the high mileage oil is supposed to have extra cleaning agents in it to remove the sludge buildup in the engine, could the sludge have found its way into the oil pan and possibly clogged up the oil pickup tube? The ticking was not continuous and would be at idle or acceleration.
No rhyme or reason to when you would hear it. I also wonder about an exhaust manifold leak which could sound like ticking. If the problem is an oil pickup tube being clogged up, can the oil pan be removed with the engine still in the truck?
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Odd thing on the 97' Ranger that showed up today. I was backing out of the spot at the local Shell station, (on an incline) and the pedal went to the floor. Never happened before. I pumped the brakes a few times, and they came back. On down the street, slowing for the stop sign, pedal went to the floor again.
Not throwing codes, fluid levels are good, only seems to happen at lower speeds/idle. Sometimes pumping brings the brakes back, sometimes they come back all of a sudden.
I can hear a "sucking" kind of noise coming from where the pedal connects to the booster, up under the dash. I looked at it, and nothing *appears* to be broken.
It almost feels like the pads are against the discs, and the pistons/calipers have to reach for them before the brakes apply. (If that makes any sense)
There should be about 50% of life left on the pads, but i haven't pulled the fronts wheels yet to look.
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What this could be? Doesn't happen every time but when you start the car I can hear something like "pssh psssh pssh psssssssssss...." below the car like some hose has a hole in it or disconnected etc.. but it comes from under/back of the car... fuel lines? fuel pump? No CEL or anything, car drives. Normally... mpg is good...
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Pulled out of the restaurant I ate dinner at tonight and I lost most power and there's a loud air sucking sound. I felt around all the boots and didn't feel any air, but it was really hot and couldn't feel a whole bunch. It's a 2003 7.3 with 295k. There is a little smoke/soot coming from the turbo area, any chance that's related? I'm perplexed...
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2005 Prius. 190k miles. In San Diego, so hot summers...not Phoenix hot...90s. Mild winters. No san or salt on roads.
5k oil and filter regularly. Got new HV battery at 142k. Changed the coolant switching valve done . Coolant pump changed under Recall. Steering midshaft done. Front pads replaced at 120k. Rear shoes getting very close to replacement. Trans fluid change at 120k per manual and at 190k. Plugs at 120k.
Two new issues: when coasting in N, pretty quiet. Driving or coasting in D, there is a growl. At 35-40 mph, wind noise masks it. Frequency increases with speed. It isn't getting worse. And no better after the transaxle fluid change. Can't be CV or bearings because it only happens when in motion in D. No lights on MFD. I have not looked for codes.
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I have scanned my car with no faults codes on VCDS, basic adaptation setting have been done on the gearbox and i have let it run in and adapt but im still getting this noise.
Im certain it is Dsg related, With the windows down you can hear it as i pull away in 1st gear, It does not make the noise in 2nd or any other gears. If i move the dsg shifter from P to D or from N to D even R it slightly makes the pulling off kind of sound which is my concern.
My flywheel was recently changed, Clutch packs looked healthy and the DSG fluid/filter were also changed at the same time. I have uploaded a video of the noise which is in the link below. When i took the video the car was simply left in P idling but it still made this sound intermittently like it does each time my car pulls off.
The noise can be replicated each time i pull off in D when the gear selection is in 1st. This is strange as simply left in park it was also making this noise when no gears are being engaged.
I dont have any of the previous flywheel symptoms which were vibration at idle in park and the constant rotational flywheel knocking sound that was there previously. This sound can always be replicated when i pull off.
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it's missing at an idle and it acts like it dont wanna take gas but once you get it going on the road it does good. the motor is a remanufacture motor it's only got 6,000 miles, new coils, plugs and wires, cam sensor, crank sensor, idle air control, mass air flow,and temp switch.
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My f150 cranks but will not idle unless you hold the throttle at 2 rpm. It has not ran hot. There is no oil leaks.
I've changed the following parts:
Cam sensor
Crank sensor
Fuel pump
Fuel filter
Coils
Spark plugs
Iac
Tbp
Maf
Fuel pressure
Pcv
I've have tried everything i can think of so i took it to a shop they said just get a new motor I don't think so.
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I just purchased a 2001 F150 XLT with a 5.4 engine. If I start the truck and let it idle, it will hold steady around 900rpm's. If I give it a little gas and then let of (all while in park). The rpm's never come back down to 900. It hangs at approximately 2000rpm's. If I turn off the truck, wait a few minutes, start it back up, the engine idles fine again at 900rpm's. If I give it some throttle again, the same scenario takes place.
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So, I don't use my F150 too much and an animal made a nest int the intake tract and the nest material (chewed up air filter) got sucked in the throttle body all the way to IAC valve. So I thought I cleaned everything out, even got a new IAC. It starts now but just dies. I didn't remove the throttle body, should I? Where else do you think I could I find this stuff?
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I just acquired a 2003 with 5.4 L. Did all new plugs and coils, cleaned MAF sensor, changed air filter, oil, transfluid and filter (obviously not related).
Upon start up and idle the truck has is rough, enough that it will vibrate the whole truck SLIGHTLY. Once in gear and warm, it smooths out and is fine. Unit the next stop and start.
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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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Recently I just purchased a 1998 F-250 (light duty) with 11X,XXX miles on it. Up until today, it was running perfectly. However, today it started idling rough whenever I was at a light. This was only when I was stopped, in gear, with my foot on the brake. In neutral or park it didn't do it, and it stopped as soon as I gave it a little gas. No CEL either. I've looked around, and saw that it might just be "feature" of the 4.6. I also have seen to clean the MAF, but wouldn't that also give a rough idle when in park/neutral? Same with replacing the coil pack.
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I got a 97 f150 4.2l from my neighbor. he takes good care of his vehicles. he sold it to me cuz it started to idle very rough like a misfire. it is hard to start when cold spits sputters and pops. once started idles like it wants to stall, then will idle normally then back to rough. back and forth like that. runs like a champ when going down the road . check engine light was on took it to auto store they checked codes . said bad o2 sensors so i changed them. still same issue. neighbor changed coil packs checked spark plugs and wire. every thing fires good. i changed iac. still didn't fix problem. could this be a bad egr valve or sensor? if so how can i diagnose this? he also thought was a clogged cat and bored it out. tight budget can't afford to take it to a mechanic. Was told spray carb cleaner spray around engine to check for leaks that did nothing at all...
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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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Truck seems to have a rough idle not bad I had kid in back seat and ran into store came out and he asked why my truck was shaking. Plugs been changed dunno anything else I could do.
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I bought this truck used and when it's in drive the engine idles rough and seems about to stall when the ac is on at a stop sign or red light.. I've tried it w/o the ac on and it seems a little better but not as smooth. Idle in park is fine.
When I should start looking? Spark-plugs? spark plugs wires, disturber cap, fuel filter etc...
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I have a 1977 f250 460 with c6. As far as I now everything is stock on the motor. The carb is a motorcraft but I cant see what model it is, there is a ID tag that I need to get the numbers off of so I can see what I have.
I don't know much about carbs so I'm trying to learn as I go, but what has me wondering about the secondaries is going up inclines. We have a canyon that is a decent grade and long, I was towing a empty flatbed trailer and with my foot all the way down could never get it above 40 mph it just felt like that was it. I have been out playing with no trailer and it feels like I can get them to open up when it down shifts, but cruising along at 55 and stomp it nothing.
I am worried about pulling our camp trailer with it and that is the main reason I got the truck with a 460. What to check?
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My buds 2003 4.6 liter stalls every time he takes his foot off the pedal. Runs fine otherwise, no roughness or anything, you just have to keep your foot on the thing to keep it from dying out.
We checked for codes and found none. I checked vacuum connections and they looked OK.
Is there an easy way to test the IAC or should we just throw a new one in and cross our fingers? If we do change it out, does the truck need to be driven around a bit for the computer to re-learn anything?
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