vacuum leak

Hi everyone, I have been dealing with a check engine light pushing P0171 and P0174 codes. I ended up replacing the PCV valve and the EGR valve but haven't been able to resolve it. I made a homemade smoke machine and put it through my engine and discovered smoke coming out of the locations...

I have a 1999 Mercury Mountaineer V8 5.0L. I have had to do a bunch of work (myself) to get the car running and get it where it would pass emissions. I've replaced the EGR valve, CAM sensor, plugs, wires, etc., etc. I got it running and the check engine light has gone out. The problem now is...

So a few days ago, my 98 explorer started struggling at idle. I'll come to a stoplight, and it will dip down to like 500rpm and struggle to stay on. Last night after work, I got 2 misfire codes for cylinders 3 and 6. Today I changed all of my spark plugs and the wires. Cleared all the codes...

Hello everyone, I'm hoping for your input and opinion about this CAR: Explorer 2013 V6 standard Symptoms: P0430 P0420 which is the catalytic converters are below efficiency threshold. Both sensors readings are about 0.74 constant when car is idling at full stop. Higher than average fuel...

Hello, 1st post here! I have an explorer 4.0 ohv that has 2 codes on it: P0171 and P0174. They are for "system too lean" for banks 1 and 2. When looking at the live data from my obd2 scanner, I see 0 volts and short and long term fuel trims at -100%. I have tried this obd2 scanner on other...

Those symptoms point to a frozen caliper right? and yet upon inspection today brake fluids full; none leaking on the tire (I had a froz caliper yrs ago on a Pontiac). My neighbor, THANK YOU TOM, came over and checked the obvious. What he found was a broken vacuum line to a part I can't identify...

Hey guys, After extensive squinting at page after page of threads going completely off topic, none I've read has helped resolve this problem. That being said: 99 Mountaineer AWD 5.0L 150k Miles, unmolested dealer serviced Charged A.C., cold lines, compressor working perectly, EATC, blower...

I inherited this Explorer from my late father. The check engine light was on all the time, I asked him about it to which he said "it's nothing, runs fine, don't worry about it". He drove it for years that way. When I started driving it the check engine light made me crazy so I started looking...

HI guys. I just picked up an 03 Sport trac XLT (4.0 SOHC) and I see some missing vacuum hoses or related parts. The truck idles fast (around 1000 RPM's) and the air from the vacuum leak is both hot and noisy. If someone can identify from my pic below and let me know what part is missing (2...

First, the two middle vents do not blow hot air as strong as the defrost vents do. Even the rear vents to the back seat blow strong and healthy. This leads me to believe from what I read here that I must have a vacuum leak. I have checked every possible hose and replaced both upper and lower...

I have a 2000 Ford Explorer XLS, 4.0L OHV engine with 188k miles. ****Long story starts here, skip to "Short Story Starts here" for current issue, or "Really Short Story Starts here" if you are really, really impatient!!******* Three or four weeks ago it started losing coolant...

I have been getting the lean codes for Bank 1 and Bank 2. I clean and replaced MAF. I had previously replaced the famous vacuum elbow (and it's still good). I have had a smoke test done to find any other vacuum leaks. A small amount of smoke came from the EGR, replaced it. The codes have...

There are several threads describing a loss of heat or a/c when the engine is under load. The problem 99% of the time is a loss of vacuum during acceleration that the vacuum reservoir cannot maintain (its sole purpose) vacuum and the air doors close temporarily with no vacuum to keep'em open...

Hey everybody, I have searched throughout the forums with a ton of confusion- a lot of people with the same issue have been replacing parts that don't equate with vacuum leaks. Anyways, so a little background on the Expo. It's a 1997, 5 speed, 4wd, 4.0 ohv. I know these things have a ton of...

After a night of "hot rodding" every time I push the gas the engine bogs down and won't shift until way over 3000 rpms. Has very little power under 40 mph but still shifts. I Can NOT accelerate over 50 mph. There is Also a hissing sound that becomes worse when gas pedal is pushed and my gas...

Hello all. I've just completed a valve cover gasket replacement on my 2002 4.0L SOHC 4WD Explorer, with help from several threads on here. I've gotten everything back together (after hours of messing with the EGR tube), and now I've got a rough idle and a hissing sound from the rear of the...

Aloha team, 3 quick questions: 1. Anyone have tips for determining if the PCV hose from the back of the engine is bad? How about replacing it- any easy way to remove/replace? 2. I just replaced intake gaskets - how can I tell if I'm still leaking? 3. Where else to look for a persistent 171...

Aloha everyone! :exp:Anyone have experience with a melted DPFE sensor? I'm working a bunch of issues at the same time: - extremely rough idle and loss of power - replaced cats - still sounds like rocks in the muffler - replaced upper/lower intake gaskets (torqued lower to 10ft pds - replaced...

I don't know what I'd do without Explorerforum.com... you all are so great. I want to give the community an update on the biggest problem I've had recently with my 92 Explorer Sport I bought a month ago. I want to make this as easy to read as possible, so try to bare with me. Thank you...

I have a 97 Ranger with the 4.0 V6 and 4X4. It almost sounds a little like it has a turbo and it's causing it to miss like crazy on cylinder number 5 but it's not throwing any CEL? It sounds like it's coming from somewhere near the firewall? Any ideas? I've searched all the lines that I can see...

Last summer I purchased a 1996 4.0 L V6 Ford Explorer with a manual transmission and 135,000. Aside from a small oil leak from the valve covers I had repaired, I had no problems until the alaskan winter set in. After the temps dipped down into the single digits, I noticed startup become a lot...

Hello all, I have a 2006 Ford Explorer with a faint vacuum leak heard while engine is driving/under load. Sounds like it could be coming from under hood or floor board area. I can hear it with the windows open, too. Unfortunately at idle, it doesn't make the whistling noise. So it's hard to...

I have a 2000 explorer Limited, 5.0 L 8 Cyl, engine code P. I been getting radon misses and found my wires were shot. When replacing the wires, I discovered that a vacuum line appears to have melted- problem is I can only locate one half of the equation. I'm sure I'm just over looking it. can...

My '03 Ford Explorer v6 has been shuddering a lot for the past year. It will rev up and down when idle, even stall out occasionally. It has gotten progressively worse so I took it in to a mechanic. They told me to change the Mass Air Flow Sensor and spark plugs. I did so and it worked great...

Hi, i have a 97 Explorer V6 4.0 with the codes for lean banks 1 & 2. Sitting at idle it has sort of a surge or hesitation but has no trouble accelerating. I have only had this Explorer for about 2 months and no issues til now. I did put seafoam in the gas tank when i first bought it and...