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Old 09-23-2010, 02:38 PM
garyb5756 garyb5756 is offline
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Default 1993 S-10 4.3 Rough Idle


I am new to this forum and just trying to find some help. I purchased a 1993 S-10 2X4 with a 4.3l engine. The truck ran fine on the way home and for 2 days after. Then it wouldn't start the next day and had no spark. I changed out the Dist. Cap, rotor, coil, ignition coil, plugs, and wires. It runs much better but still has a bit of a rough idle. I also replaced a broken vaccum line in front of the TBI. Any idea's on why it still idles rough? I haven't replaced the PCV yet but I will. The truck only has 103,000 original miles and from the looks of the dist. cap, it was sitting a lot and not being driven. Any help would be appreciated.
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Old 09-23-2010, 06:06 PM
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92xcab 92xcab is offline
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If it was sitting I would go over all the vacuum hoses.

92 V8 S10 X-4x4 in progressSOLD Tilt - A - Whirl Sold
67 Chevelle oh yeah with a BB SOLD
87 Mercedes 300e SOLD
99 Tahoe 4x4SOLD
97 Audi A4q 1.8T my SOLD
13 Ford Edge AWD Limited wifes DD
07 F150 STX wifes dd(traded in)
"In the end we're all just chalklines on the concrete
Drawn only to be washed away
For the time that I've been given I am what I am"
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Old 09-24-2010, 08:47 PM
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03dirtydime 03dirtydime is offline
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Cover the vacuum lines with carb cleaner with it running, if it has a leak it will rev up. A good seafoam could help too.
03 dime- lowered, glassed interior, shaved and go fast goodies

01 noma- In the works of a rebuild with a SBC
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Old 11-29-2010, 02:34 AM
Compstall Compstall is offline
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Location: Tacoma, WA
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So what else / where else would you look? My '88 does the same thing and I can't find the problem.

Here's what's been changed:

MAP sensor
Cap, rotor, plugs, wires
pickup coil
fuel pump
fuel filter
egr valve
egr solenoid
rebuilt TB
replaced intake manifold gaskets
had injectors cleaned/flowed
replaced all vacuum lines

Truck runs great anywhere but idle. Excellent throttle response, runs smooth down the highway. I'd drive this thing across country right now, it just runs really rough at idle, and will die on occasion at stop lights in drive.
- Brent
'88 S10 4.3L single cab
'08 Mazda CX-9
'11 Mustang GT
A few Jeeps
'03 Kawasaki ZR1000A1 (For Sale!)
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