'93 C1500 stall and backfire

Tiny
WHEEL1086
  • MEMBER
  • 1993 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 30,000 MILES
My '93 c1500 with a tbi 350 will sometimes stall under moderate acceleration; the engine only has about 30k miles. There was also a time when the check engine light came on, I popped the hood and moved the throttle lightly and the engine stalled, I did it again and the engine stalled then backfired through the throttle body. After this the light went off and the engine seemed to function relatively normal. Also the transmission was slipping badly when light was on and went back to normal after light went off. Strange
Tuesday, March 1st, 2011 AT 6:02 PM

5 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Check the vss/vehicle speed sensor. Check for applicable mil codes, you can check those codes yourself. Use a gage and check fuel pressure. How long since a tune-up?
Was this
answer
helpful?
Yes
No
-1
Tuesday, March 1st, 2011 AT 6:25 PM
Tiny
WHEEL1086
  • MEMBER
  • 8 POSTS
I just put in a borg warner vss, both shift solenoids, oil pressure controller solenoid and a new servo spring in the transmission. In the engine I have replaced the tps, icm, iac valve, map sensor, ignition coil, distributor cap, wires, plugs, fuel filter, fuel pump; I might be forgetting something, but all these parts probably have 10k miles or less on them. I have also added headers, edelbrock 360 degree intake, and poweraid throttle spacer.
Was this
answer
helpful?
Yes
No
Wednesday, March 2nd, 2011 AT 4:42 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If the check engine lite came on, what was the code?
Was this
answer
helpful?
Yes
No
-1
Wednesday, March 2nd, 2011 AT 3:51 PM
Tiny
WHEEL1086
  • MEMBER
  • 8 POSTS
I had it checked at an auto parts store, but it showed nothing. I have suspicions about the ecm.
Was this
answer
helpful?
Yes
No
Wednesday, March 2nd, 2011 AT 8:30 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
It should have showed at least a code 12. You can check mil codes yourself. Use a jumper wire between the A & B terminals at the data link connector, turn key just till the dash lites come on, no further. Then the mil starts flashing, you count the flashes to get the codes. Your looking for two digit codes. I'd use a gage and check fuel pressure. Some of the national brand autostores used to loan out a fuel pressure gage.

A picture of the datalink connector is below. There may not be any codes, but, it is handy to know how to check.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Wednesday, March 2nd, 2011 AT 9:14 PM

Please login or register to post a reply.

Related Engine Backfire Content

How To Fix an Engine Backfire
VIDEO
How To Fix an Engine Backfire
Instructional repair video
Backfire Repair
GUIDE
Backfire Repair
When your engine backfires it can do so in one of two ways. First and the most common way is when the engine is running a small explosion of unburnt fuel is ignited inside...
VIEW MORE