I just bought a 1991 F150 with a 302 (5.0). It idles at around 2600-2800 RPMs. The previous owners replaced the TPS and IAC, but it still idles fast. Ford dealership told them it was a vacuum leak. Are all the vacuum lines close to each other? How easy is it to locate/fix the problem?
View 2 Replies1991 F150XLT, 5.0, E4OD....Should the EFI system bump up the idle speed when the AC system is operating to compensate for the compressor load? Obviously I'm asking because mine sure doesn't. With AC on, the idle speed will drop to around 300rpm in Drive, like when sitting at a red light for example. Surely this isn't normal operation...is it?
View 4 RepliesI now have a 1991 ranger 3.0 super cab. I need a step by step walkthrough of how to time it. Keep in mind that I ha the distributor out while turning the engine over so I need from start to finish, including the spout connector. It runs right now but idles high at the start and the. Stumbles down to about 500rpm and sometimes dies....
View 12 Repliesi have a 1991 5 speed F-150 that i only use to plow my private rd... and have been using it like that for about 8 years. we have had quite a snowy season in NH, and it has been running good, until yesterday. while pushing snow, it idled really high... like the clutch went (had a new clutch put in 4 years, 400 miles ago.) i checked the clutch fluid. nasty brown, but no leak. it sat over night and i tried again today. same thing... except I realized it only seems to be doing it in 4 high and 2wd. in 4wd low, it seems to work fine. hoped to find some solution on the site, but there was nothing. we're getting another 4-6 tonight....
View 5 RepliesI just bought another 1991 Ford. This one is a 1/2 ton XLT Lariet with the 302 and for the first time I own a short bed. I also have a 1991 F-250 XLT with a 460 and a 8' bed.
Here is the problem, ( I think) it will not run or at least not for long. The fuel pump, which I am guessing is in the rear tank will not stop running. On the F-250 the pump stops running after a few seconds after I turn on the key.
Where should I start to find out my problem with the fuel system?
My vehicle:
1976 F150 2wd Extended cab
390 4bbl
c6 transmission
4BBL Edlebrock Carb
Dual fuel tanks, only rear main tank connected
My problem: For the first year I owned the truck, everything ran fine and it started up really quickly even after it sat for a few days or a few weeks. I have since, for about the last year or so, had to crank it for 30-45 seconds to get it to start. This all started around the time my fuel pump went out. I replaced it with an Airtex fuel pump from Autozone. I also installed a glass in line filter before the carb in front of the distributor.
I noticed that after about 4-6 hours, the fuel had drained out of the filter and that's when I would have to crank it forever to get it going. It also seems like there is no fuel in the carb as it doesn't even try to start when it first gets cranked. I thought this was a bad pump, so I bought a new one last week and tried it again. Sure enough after about 4-6 hours, everything is empty again and it takes forever to start it. So it's not a bad pump, or so I think.
The other day I backed it into my driveway and left it, something I never do. I checked about 4 days later and there was still fuel in the filter. This makes me think that gravity is making it drain back to the tank.
Is there something that would cause this? Also I have found a one way fuel check valve online that is supposed to remedy this type of problem. Do they work for this situation? Or is there something else I should be doing to fix this? It has taken a bit of a toll on my starting system having to crank so long all the time. I have so far had to replace my starter, starter solenoid, and all the battery cables, starter cable, terminals, etc. due to excessive wear.
The valve I found is here : [URL] .....
I've got a 01 f150 yesterday stopped running (like it ran out of gas). Has half a tank. Fuel pressure at rails good but truck will not turn over. Fuel pump and filter less than year old.
View 1 RepliesI've had a fuel leak near the pump of my 79 F150 with a 400 for some time. I didn't know exactly where it was coiming from, but fuel was being sprayed on to the oil filter from something near the pump. I assumed it was the steel line, and that it had rusted through or cracked, and was going to replace it when I had a chance. I was poking around today though, and realized that the fuel was not leaking from the line, but from a hole in the side of the mechanical pump.
For someone who knows what these pumps look like, there is a horizontal cylindrical bump out near the top of the pump, on the side of the pump that is away from the engine. The fuel is spraying in a mist out of one side of that. To me, it always seemed to be a screw channel, but I didn't think the pump was 2 halves put together? Need to know more about my pump, what that bumped out section is, or why/how fuel could be spraying out of it.
1993 F150 302. What does the fuel canister purge solenoid/vac play in the furl/emissions arena?
View 5 Repliescant figur this out have no signal to injectors and no power at fuel pump 88 f150 5-0
View 2 RepliesWhy the frame mounted fuel pump might run after the key is turned off? Then when you turn the key on it may or not run. If it does run it keeps running. shouldn't this shut off after pressurizing the line? is their a pressure switch in the pump that's failing? This has the 3 pump system...
View 4 Repliesfor the past week we have been trying to figure out what is wrong with our truck. We recently bought it and it ran fine. Then got in a minor accident just a fender bender and it started acting up so I got towed to garage. First it would run when cold, but when hot fuel pressure would drop to 28 psi.
So I put new fuel pump, it started but still did the same thing hot 28 psi fuel pressure shuts off. So I put regulator on it, then had 0 fuel pressure won't even start. So got a another regulator thinking I got a bad one, still 0. Checked relay, there fine. I'm gonna check lines and see where fuel stops at but everything is new on it.
I have an 87 F150 4x4 4.9L EFI with a single tank. Fuel pumps keep running even when the key is off. I tried swapping relays but the problem still exists. The engine will start and run OK for about 15 secs. then die. I installed a new low pressure pump, high pressure pump seems to be OK. I also installed new fuel filters. I dont want to just throw parts at this truck, where do I go from here?
View 4 Replies1994 150 300 6. parked truck after lunch finished work and it wont start no fuel comes out of the valve. Can't get the pump to work even when jumping the 6 pin. heard the relay click still nothing. Checked the inertia switch it wasn't popped. Took the pump out jumped it straight from the battery pump works . I know there has to be something i am missing...
View 7 RepliesI'm looking at replacing the fuel lines in my 94 F150 and the big question is what to do with hooking up to the fuel lines coming out of the fuel pump hat and the fuel rails? Ford uses a specialized pressure fitting on it's custom fuel lines. I think there may be some third party fittings that would replace these, but I'm not sure. I could use a standard hose and cable clamps, but I just don't trust that kind of connection for a fuel line.
View 5 RepliesI have a 1986 F150 6 cyl, dual tanks, no AC, manual fuel pump. Just recently, I have been having issues with the tanks. At first it seemed like the back tank was siphoning from the front tank. Now I have fuel coming out of my front tank filler neck. When I open the back tank gas cap, there is enough pressure to spray me with gasoline. I am not familiar with the fuel delivery system of my truck ...
View 2 RepliesSo I've been having this issue for a while and I think I know what it is, just wanting to confirm it is the problem before I go fixing it. My car idles at high RPM's, at around 1-2k when I am sitting at a stop sign or stop light. I replaced the MAF sensor but that wasn't the issue. I assume that it is the throttle body or the sensor.
Also, I came out the other day to park my car in the garage and I saw a huge puddle of water where the passenger puts his/her feet. It was all in the carpet and I just dried it up. It was raining out but I don't think I have a leak or anything. I was told it might be my heater core that went out and that the AC is the problem.
So my "farm truck" is idling very rough, to the point that sometimes that it stalls out. At high idle it runs fine but when its at a idle its very rough. Its been running fine until probably a month ago or so and its just getting worse. What it could be? I am thinking it might be that something is dirty but i just dont know where to start with figuring out what the problem is.
View 9 Replies1999 ranger, 2.55 speed. truck idles with very high rpm's when driving and shifting gears. have changed the AIC, mass air sensor. Throttle position sensor and still does it. the AIC has been changed 5-6 times in 6-8 months as parts store kept telling me it was that. What can i look at, check, etc...
View 6 RepliesThe carb on my 460 in my truck is acting funny. It almost sounds like a dragster It Idles really rough. I tried setting the Idle mixture screws on the side of the metering block. I bottomed them out and them turned them out 1 1/4 turns. I started turning them in till I got the highest reading on my vacuum gauge, about 13 hg. The screws are only about 1/4 turn from being bottomed out. It was running smoother, then it stalled when I restarted it, it started running really rough again.
The exhaust smells of gas. I turned the screws all the way in just to see what would happen, I thought it should stall but it didn't. I had my timing light hooked up and checked it now and then during all of this and it didn't change at all. The screws had almost no resistance to turning, shouldn't they have some resistance?
So my 98 f150 xlt 4.6 is having a issue where the truck is jumping from 1500 rpm to about 2500 - 2600 rpm. You know sitting there trying to get up to speed. then all the sudden i look down and its at 1500 rpm. but still not really going anywhere. So i give it a little more throttle or gas and it jumps from 1500 to about 2500. Its been like this for a month but i thought it was crap fuel. What is the cause or maybe a solution?
View 4 Replies