Ford F-150 - 1997-2003 :: 1998 - Truck Is Jumping From 1500 To About 2500 - 2600 RPMs
Oct 24, 2014
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?
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Mechanics say they don’t know what wrong… I had some transmission work done on my truck – mostly an leak and replacing the harness – and ever since then after it rains or if we have a heavy dew my truck does the following:
Driving from O to 49 miles an hour truck is fine, as soon as I hit 50 the truck starts surging and you can see the tachometer jumping from 2000 RPM to 2500 RPMs. I drive around 17 miles to work where my truck will sit for seven hours. On the way home the truck is fine. I find this to be more of a problem when the truck has sat for a day or two over the weekend without driving it. Sometimes the “check engine” light will come on, sometimes not.
I have taken it to two different places and neither one says they can find anything wrong with the truck. I have driven this truck for over 11 years and know it very well. There is something wrong, but what? 1993 Chevy Silverado 3500 Diesel....
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My F150 with 175,000 miles on gave me a the ol' P0305 code indicating misfiring in cylinder #5. I changed the plugs and wires using Motorcraft wires and Motorcraft AGS34FM plugs.
Now the truck idles fine, does not give a OBD code but runs rough at 2,000-2,500 rpm. Tried it out on the highway and it started "bucking" a bit. Not sure what to try next.
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I've got a "new" Blazer -95 4.3 vin W about a month ago. It has run about 170,000 km.
But now it looks like it was a bad buy, it runs bad. The rpm starts jumping between 1500 - 2500. Suddenly the break and ABS warning lights in dashboard lights up, and sometimes all black out and it stalls.
At first it started acting like this when towing a trailer on the highway, doing 80 km/h. But now it does it at any speed.
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I have a 2003 Camry 2.4 LE with 120k miles on it. It's been very well taken care of. As of now, here is the maintenance that has been completed at my dealership. By the way, I don't trust dealerships, but I do have one nearby that is actually beyond outstanding (and I know a little about cars):
- Regular oil changes, and always with 5W-30
- Radiator flush and thermostat replacement
- Tranny flush
- New front brakes, rear brakes cleaned, and lines flushed.
- Oil pan gasket replaced
- Valve cover gasket replaced
- Spark plugs replaced (at around 105k)
So, with this information being provided, here is my current problem. Lately, as I accelerate between 1500-2500 rpms, the engine has a louder than usual (but not too loud) groaning noise. Basically, the engine just sounds a tad louder than normal along with groaning noise. The engine also feels as though it is running kind of "dry" (if that makes any sense).
Now, above 2500 rpms, it's just fine. It's amazing on the highway, but I feel as though it has slightly lost acceleration in the city. The only issue with the car is the infamous greyish/blue smoke at startup, but that rarely happens and when it does, its a small amount of smoke, and it has never affected it's performance or gas mileage. Another thing is that I had to have that dreaded oil splash guard removed, because apparently the timing chain punctured it and it was about to fall off.
This problem has been recent within the last month. Just before this, the car has been on a roundtrip to Tucson from Tulsa, and Amarillo twice, complete with 32+mpg on the highway! So, what's wrong? Serptentine belt? PCV valve? Cam or something underneath the valve cover?
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I have been having some major issues with my truck!
The whole truck is vibrating when on. When I accelerate I hear a loud noise like something is hitting a fan. I'm scared to even drive it. The rpm's have been jumping around.
What could be causing this? I already replaces Fuel filters.
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-My pickup was parked and hit in the rear axle in January. I had to have the whole axle replaced as well as the leaf spring to frame mounts.
-I finally received the pickup back and now when the trans is in Drive it will not up-shift until the rpms reach 2500 and it is a hard shift.
-Also the speedo does not work now.
-Check engine light also came on with code P0500- vehicle speed sensor.
-I replaced the VSS at the transfercase and the ABS sensor in the rear differential with no change.
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2001 F150, about 3 weeks ago I drove through standing water that was probably about 2 feet deep, as soon as I did that the truck started jumping real bad and almost died. I drove it around for a little while and it started to run better. After that it started to feel like it was misfiring badly. Between 40 -50 mph on the highway just giving it gas a little the jumping was pretty bad.
I decided to change out the plugs, thought maybe water got onto them and this was causing the issue, this was my first time changing the plugs in the truck and it was not nearly as bad as it could have been! I was able to do all of the plugs except number 7. The fuel injection line is right on top of that plug and I did not want to remove it!
After changing the 7 plugs the truck is running better now, I have not yet felt the jumping that was happening, my problem is that on the 4 plugs on the passenger side all 4 looked to be covered in oil. My question is does this mean my head gasket is blown and how long do I have before I am going to have to put alot of money into this truck to fix this issue?
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My 2008 Accent started to stutter between 1500 and 2500 rpms. Now the check engine light has come on, and the engine is idling rough.
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We got our first taste of fall weather in Houston this weekend, and with it I've discovered a new problem with my truck. After the engine was up to temp, I noticed that the heater would blow cold air any time I sat at idle. If you rev up the rpm's to 1500-2000, you can feel the air start to get warm again. I'm guessing this means my heater core needs to be backflushed.
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I have a 1998 Ford Escort which I drove about 450 miles in frigid weather over about 8 hours in mid January. After arriving at my neighborhood and getting off the expressway, I couldn't get the idle on the car (manual transmission) to go below 2500rpm's. Further, upon taking off, the car was trying to stall, and I was forced to feather the clutch through town driving and keep the throttle up so it wouldn't stall, even with the clutch in. The weather at the time was about -7 degrees (f). The next day the weather continued, and thee car would start, jump to the same idle for 10 seconds, then drop suddenly to 500rpm, then stall out. I wrote the car off, cleaned it out over the next week, and then I tried to run the radio while doing so last weekend. I got the car to start, and run normally. I think it may be a computer issue, but it may also be the temperatures. The car has 207,000 miles on it.
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!995 honda accord, 5 speed. Idle is fine until the engine warms up, then fluctuates between 1500 to 2500 rpms. The idle control valve was cleaned- no change. Valve was also replaced -also with no change. Put old valve back on. Computer was disconnected after cleaning and also after each valve change.Would the next step be to remove and clean the fast idle thermo sensor? Also how do you check the coolant lines coming in. Anything else I would need to check, clean or replace.
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I have a 98 F150 4x4. I had some trans trouble so I pulled it out and had it rebuilt. Now when it shifts into drive the rpms speed up right before it shifts. What is causing the trans to do this? It doesn't do it all the time, only if I take off faster the usual which is most of the time.
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1998 F150 4.6 automatic.
Had problems with battery light. Was intermittent. Battery cables wouldn't stay tight, replaced them, light stayed off. Light back on now, constant. Battery reads 12.5ish off, 14.3ish running under load (lights, AC, etc.).
When truck is started, even cold, it doesn't rev up the RPM's and then die down to idle speed. It just goes straight to around 550rpm and surges slightly up and down between there and 650ish. Can these be related?
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I have a 1997 forkd F150 with a 4.6L Romeo engine. I have recently rebuilt the engine and now since it is put back together I am having a issues that i cannot pin point. When the truck is running and in gear my RPM drop to around 500 or below and my oil pressure drops and comes back up when the rpm's come back up this an intermittent problem and I have replaced the IAC valve and every once in a while i get a P0401 code for the exhaust recirculation. I think I am loosing some kind of vacuum. It was not doing this when I tore into the truck. It seems to be running okay not hesitation.
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If I don't keep in the throttle immediately after start up it will stall a lot of the time. It doesn't do this every time or if it sits for a while but if I drive it and then stop off at a store or something and then go to start it back up it gives me this problem. I notice it idles about 3-4k RPM's when I stop at a light or something too.
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If I even fart in my truck, there is a jingling underneath. I know my ball bearings need to be replaced. But, what the noise is. It sound like loose change in my pocket. I can't describe it any better.
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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.
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I have a 1998 F150 4.6 2wd regular cab with 255,000 miles on it. Lately it has had some problems. The first is that it will run really rough when under a load, meaning when I step on the gas. It runs smooth at idle and at cruise but when I step on the accelerator it bogs way down and almost shuts off. I have changed the spark plugs, spark plug wires, coil packs and fuel filter. Now I'm thinking maybe fuel pump?
The other issue is that when the truck is having to work a little harder (i.e. pulling a trailer or running in the summer with the AC on) it will start to run hot. I have changed the thermostat, flushed the coolant, cleaned out the radiator, etc. and it still does it. Could both of my issues be related to a fuel problem??
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I have a 98 F150. The motor was replaced three months ago and have had no problems until now. The truck had trouble starting so i put an alternator on it. Fixed for a while and then it started blowing fuel relay fuses. I replaced fuel pump and filter. Truck has trouble starting after sitting overnight. When I am driving and floor it, once it hits about 4,000 rpms, the truck bucks like its the transmission but the rpms drop and then pick back up. Fuel pressure is right where its supposed to be.
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I noticed a vacuum line hanging under my 98 F 150 4x4 I traced it out to my front axle question is where does the other end go I have looked but no luck to where it goes.
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