SPONSORED LINKS

Little or no fuel in cylinder one

Tiny
SPENCER10591
  • MEMBER
  • 1993 CHEVROLET S-10
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 149,550 MILES
I just got the vehicle listed above Blazer. It has the Central Port Injection on it. Just replaced the whole spider injector and seemed to be running okay. Also did plugs, wires an new distributor. Set the timing correctly and ran a bit better but when I try to run the engine it seems as though the #1 cylinder is dead. I can take off the plug wire, from the spark plug while it's running and it does not change the way the engine runs. When I run the engine without the spark plug in it, I did not notice any fuel coming out of the spark plug hole. It may be getting some fuel as the new spark plug had carbon all over it. Also got a new fuel pump for it as well. 90 PSI in tank pump with new filter. Not sure why it's either not firing, getting fuel or another problem I have not noticed yet?
SPONSORED LINKS
Thursday, July 15th, 2021 AT 10:44 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The first thing I would do is check the compression. You should have at least 140-160 for it to contribute to the running. If the compression is low, it could be a burnt valve.

https://www.2carpros.com/articles/the-reasons-for-low-compression

https://www.2carpros.com/articles/how-to-test-engine-compression

You can rent a tester at a parts store for the test. Let me know the results so we can continue.

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Thursday, July 15th, 2021 AT 12:08 PM
Tiny
SPENCER10591
  • MEMBER
  • 5 POSTS
Thank you very much. I am currently at work but should be able to test the compression around 5:00 pm today. I will be able to send pictures as well.
Was this
answer
helpful?
Yes
No
Thursday, July 15th, 2021 AT 12:52 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

I will be here.

Roy
Was this
answer
helpful?
Yes
No
+1
Thursday, July 15th, 2021 AT 12:57 PM
Tiny
SPENCER10591
  • MEMBER
  • 5 POSTS
Okay, just tested it. Says it's at about 121 PSI.
Images (Click to make bigger)
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Thursday, July 15th, 2021 AT 5:04 PM
Tiny
SPENCER10591
  • MEMBER
  • 5 POSTS
I also checked numbers 2, 4 and 6. All have about 138 PSI. Number 2 spark was black and had oil on it. Guessing number 2 wasn't working all that good either.
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, July 15th, 2021 AT 5:31 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What is the fuel pressure? You can rent a tester from a parts store to verify it.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

FUEL PRESSURE
1. Ignition "OFF" for 10 Seconds.
2. With ignition "ON," engine "OFF" and fuel pump running, pressure should be 380-420 kPa (55-61 psi).
For additional fuel pressure testing procedures, See: A L L Diagnostic Trouble Codes ( DTC ) > Related Tests, Information and Procedures > A - E Charts & Related Test Procedures

Roy
Was this
answer
helpful?
Yes
No
+1
Thursday, July 15th, 2021 AT 5:57 PM
Tiny
SPENCER10591
  • MEMBER
  • 5 POSTS
Checking the fuel pressure soon. Will let you know the results in a day or when I have time to work on it again.
Was this
answer
helpful?
Yes
No
Tuesday, July 20th, 2021 AT 3:47 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like a plan.

Roy
Was this
answer
helpful?
Yes
No
Tuesday, July 20th, 2021 AT 4:06 PM

Please login or register to post a reply.

Related Spark Plug Replace/Remove Content

Spark Plug Replacement - Chevrolet
VIDEO
Spark Plug Replacement - Chevrolet
Instructional repair video
Spark Plug Replacement
GUIDE
Spark Plug Replacement
A spark plug is a vital part of the engine's ignition system and is responsible for starting the combustion process. As a part of an engine tune up, spark plugs should ...
VIEW MORE

Sponsored links