97 Chevy BLAZER S-10 Still PINGS


Old 09-27-10, 10:12 AM
Thread Starter
Join Date: Apr 2007
Location: united states
Posts: 11
97 Chevy BLAZER S-10 Still PINGS

Well here we go. I've had the fuel pump, spider injection assembly replaced on a 4.3 s-10 blazer, auto with air. The car will ping on initial acceleration from a stop for a few seconds. If I'm towing a trailer 2800lbs it will ping all the way through 1st gear after it goes away. Sometimes I feel a hesitation then it kicks into normal acceleration. I used a vacuum gage hooked to the hose that goes into the brakke booster. At idle it shows 21 inches vacuum. If i hit the gas the needle dumps to about 10 then jumps to abot 25-26 and goes right back to 21 inches of vacuum steady. I decarbonized the motor with 16 ozs of seafoam and installed new ac delco platinum plugs. I also removed the egr valve and yhe piston move freely. If i disconect it and run motor the check engine light come on. Hoooked back up and reset the computer no more light. Never had any codes at all. Could my distributor have been removed for the spider injection replacement and not installed back properly, just a wild guess. Always thought that a motor pings when the timing is advanced too far ahead of the full compression stroke of the piston compressing the fuel mixture. But with all this computerized stuff I imagine it can get quite complex!! HELP HELP HELP:
Sponsored Links
Old 09-27-10, 12:02 PM
Banned. Rule And/Or Policy Violation
Join Date: Aug 2010
Location: USA
Posts: 560
Are you using a “Top Tier” Fuel?
Has the fuel filter been changed recently?
Have you checked the gear at the base of the distributor for wear?

Vortec engines have a higher fuel pressure and fuel volume requirement.

Using a fuel pressure gauge confirm the fuel psi values below and post the results

Fuel system pressure with KOEO (60 to 66 PSI)

Fuel system pressure at idle (50-63 PSI)

Fuel pump pressure with return line briefly restricted (66 PSI)

See TSB # 04-06-04-047H below.

Click on the link below

When the page opens scroll to page 3

Old 09-27-10, 05:56 PM
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 759
Possible knock sensor problem is always a possibility.
Old 09-28-10, 02:20 PM
Banned. Rule And/Or Policy Violation
Join Date: Aug 2010
Location: USA
Posts: 560
Definitely not a knock sensor issue.

Had I thought (a knock sensor) was present I would have mentioned it..

Since you missed it the first time.

Here it is for your convenience more time.

Much easier than it appears.

Take you only one Saturday.

CSFI” is crap.

Click below.


Thread Tools
Search this Thread
Display Modes
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -7. The time now is 06:37 PM.