Problems with truck idling

[sx460]

Hello guys,

 

I've got a '99, 5.3L, 2WD, Ext Cab Silverado with 52K miles. Last week I decided to do some cleaning with Seafoam. I put a can in the tank and did the PCV valve input trick with Deep Creep. I ran about 1/3 of the can through the PCV valve and then shut off the motor. I let the truck sit for about 10 mnutes and then started it up. It fired right up. There was no smoke coming from the tail pipe. Two days ago the truck did not want to start. I now have to crank the motor for a while before the truck will start, whereas before the truck would always fire right up on the first crank.

 

I've taken off the IAC valve and cleaned it thoroughly with the Deep Creep cleaner. It helped fix the problem with having to crank the motor for a long time. But now the motor fires right up but wants to then die. It hesitates and falters and slightly bucks as if it were about to die. When it does this I give it a little gas and the problem just about goes away (at worse it idles roughly).

 

Tonight I just changed the plugs and it seemed to help. I've also got a new fuel filter that I plan to install in the next few days.

 

Other than that, the truck runs great. The motor feels healthy on the road, and has plently of response and power.

 

Any ideas on what I should try? Thanks!

[sx460]

Any thoughts?

[RyanZ71]

Seafoam should not be needed for any vehicle under 100,000 miles unless your running really crappy gas and not changing the oil often. Your symptoms sound like a fouled sensor somewhere. If you haven't done so already, change the engine oil, always a must after useing that seafoam crap. Check the MAF (Mass Air Flow Sensor) make sure everything is ok with that, last of all if you haven't done so, disconnect the battery cables for about 30 min, allow everything to reset, see if that helps. I don't like the idea of useing Seafoam in the gas tank, the only fuel additive I'll ever use is Techron. I hope it hasn't done anything to your fuel pump.

 

Ryan

[ken1mod]

I just think we are looking for trouble by running dubious liquids through pcv plumbing. Lots of people do though. Every engine that I have taken apart after unleaded fuel was clean. (period) amazingly clean.

 

We all want to "love" our trucks. I suggest posishing the headlights.

 

ken

[sx460]

I just think we are looking for trouble by running dubious liquids through pcv plumbing.  Lots of people do though.  Every engine that I have taken apart after unleaded fuel was clean. (period)  amazingly clean.

 

We all want to "love" our trucks.  I suggest posishing the headlights.

 

ken

 

<{POST_SNAPBACK}>

 

 

 

Looking back I wouldn't have done it. I guess you live and learn. I did do quite a bit of research on the topic and thoroughly read the can and warnings and followed everything to the T. I've got my battery unplugged now and hoping that resetting the ECU will help out. Thanks guys.

[rjirvine]

Have you tired driving it at high speeds for awhile (ie down the freeway) and see if it clears everything up?

[RyanZ71]

I've done quite a few stupid things as well with my cars over the years as I've figured since alot of people said doing it this way or that way or using this or that would not cause any problems but boy was I wrong. Now I look back at it get a little laugh out of it when I realize when it comes to our cars, we often treat them better then we do our own family. If many guys out there would take as good of care if not better care of their girlfriend or wife, I'm sure we'd be happier in the long run. I had to realize a few years ago that when it comes down to it, A car (or truck) is just a mechanical device with 4 (or more) tires on in that gets you from point a to point b, nothing more, nothing less. It has no feelings, it has no "attitude" it has no personality, it's just a mechanical device.