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9/19/2017 7:27:10 PM
Posted: 3/9/2006 8:48:19 PM EDT
My truck has a small surging problem. The engine runs fine but I can hear and feel it surge very sligtly.

It's not a big problem yet, but I would like to take care of if before it gets worse. Anyone have any ideas?

When the engine is running and moving you can hear it surge with a high pitched wine then go back to regular engine noise.

What needs fixing or replacing? Anyone know?
Link Posted: 3/9/2006 8:52:20 PM EDT
When was the last time you replaced the fuel filter?
Link Posted: 3/9/2006 9:00:38 PM EDT
Sounds like a vaccum leak to me.

Link Posted: 3/10/2006 4:05:45 AM EDT

Originally Posted By Snorkel_Bob:
When was the last time you replaced the fuel filter?



Been a while. I'll get it replaced.
Link Posted: 3/10/2006 4:06:26 AM EDT

Originally Posted By MillerSHO:
Sounds like a vaccum leak to me.




How do I find the leak and fix it?
Link Posted: 3/10/2006 4:29:26 AM EDT
I'd check the PCV valve first if it has one.
Link Posted: 3/10/2006 4:30:10 AM EDT

Originally Posted By Rowgan:

Originally Posted By MillerSHO:
Sounds like a vaccum leak to me.




How do I find the leak and fix it?



Spray vacuum lines with soapy sudsy water. look for the bubbles.
Link Posted: 3/10/2006 4:56:07 AM EDT
Link Posted: 3/10/2006 5:12:02 AM EDT
Had the same problem with a 96 or 97 Chevy 4.3L
Tried everything and took it to a couple of mechanics also.
Never found the problem and ended up selling it.

I'm pretty much ashamed to say, such a stupid little thing like this, is the only one thats ever truly stumped me... I'm not above asking for help but, that did'nt help either... and to this day I have no idea what caused it.
Link Posted: 3/10/2006 5:17:04 AM EDT
Check plugs/wires.
Link Posted: 3/10/2006 6:06:13 AM EDT
My Jeep Grand Cherokee acted that way when it had a transmission fluid leak and was low.
Link Posted: 3/10/2006 6:08:25 AM EDT

engine & intake type specs? Come on man

TBI's are know to do that. Emissions controls suck
Link Posted: 3/10/2006 6:10:20 AM EDT
Does it happen a bit after you start the truck?
Link Posted: 3/10/2006 6:16:47 AM EDT
Throttle Position Sensor?
Link Posted: 3/10/2006 6:21:18 AM EDT

Originally Posted By 9mm4me:

Originally Posted By Rowgan:

Originally Posted By MillerSHO:
Sounds like a vaccum leak to me.




How do I find the leak and fix it?



Spray vacuum lines with soapy sudsy water. look for the bubbles.



Wrong. Vacuum lines wont bubble. They have negative pressure.

To find a vacuum leak, use a can of starting fluid(either). With the engine running, select an area of the engine compartment to test and spray the starting fluid. If there is a vacuum leak the engine will surge noticeably.
Link Posted: 3/10/2006 6:22:26 AM EDT
Hell it could be a cracked spark plug wire. Check them when it is running, if you get shocked U will know it is bad.
Link Posted: 3/10/2006 6:30:49 AM EDT

Originally Posted By Pangea:

Originally Posted By 9mm4me:

Originally Posted By Rowgan:

Originally Posted By MillerSHO:
Sounds like a vaccum leak to me.




How do I find the leak and fix it?



Spray vacuum lines with soapy sudsy water. look for the bubbles.



Wrong. Vacuum lines wont bubble. They have negative pressure.

To find a vacuum leak, use a can of starting fluid(either). With the engine running, select an area of the engine compartment to test and spray the starting fluid. If there is a vacuum leak the engine will surge noticeably.


I have heard a similar method. The only difference is to use a propane torch. Not lit of course, just turned on so the gas is running. It should give you more control to put the gas just where you want it as opposed to the ether spray thing. Both will work.
Link Posted: 3/10/2006 6:39:37 AM EDT
[Last Edit: 3/10/2006 6:40:46 AM EDT by nightstalker]

Originally Posted By AR_Ron:
Throttle Position Sensor?



That was my problem on a 95 Chev. 1500 350. I'd see if it showed up in the trouble codes. I ended up with hard shifting before I could get back from Wyoming and get it fixed. Fine now.
Link Posted: 3/10/2006 8:03:22 AM EDT
It could be a lot of things. If you look in the manual and try to diagnose it, I bet the coolant temp sensor comes up as well as the ERG valve and solenoid. Could even be the coil and module. Most of these parts are fairly cheap if you replace them yourself.

GunLvr
Link Posted: 3/10/2006 8:09:10 AM EDT
Check plugs, wires, visually inspect all of the vacuum lines on the intake side, clean your injectors, if you have a rotary distributor - change the cap and rotor, clean the contact points, clean the contacts on your coil.

Link Posted: 3/10/2006 8:09:18 AM EDT
Fuel filter and vacuum lines. Check those first. You can also find vacuum leaks by spraying any aerosol around the lines. You will be able to see what it does if there is a leak. It will blow the stream off kilter if its a bad leak. Also, you haven't had the bed off lately have you? On one of my projects, I took the bed off and put it back on several times, and one time I sat the bed on the fuel line, crimping it off about half way. Won't ever do that again.
Link Posted: 3/10/2006 1:43:27 PM EDT
Basical a TUNE UP.
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