Issues Replacing the Injectors in a 2002 Chevy Silverado 3500 Cab/Chassis Truck

[n4hmr]

Hello - 

 

I have a 2002 Chevy Silverado 3500 cab/chassis truck, VIN 1GBJC34U22F129260.  This truck has a automatic tranny, 6.0 L Vortec V8, dual fuel tanks, and a 12' dump bed that was added when new.  

 

I apologize for the lengthy description here but all is relevant - issues I encountered over the last eight months.

 

02/01/20  SAT  1700  153,313                                  P/O Wlmt3642    Walmart  100.56
Try strt engine, btry totally dead.  Chg for 3-4 hrs, show 14.3V when quit.

 

02/02/20  SUN  1000  153,313
Chk btry, show 7.6V.  Ok, this one gotta go.  Specs: Group 78N  CCA 770, CA 950
Wlmrt - EverStart Maxx 78N  Item# 001043392  CCA 800 CA 1000  5Yr wrty   

 

06/28/21  MON  1100  153,405 EST
5922 Amity sold.  Needed to mv Hudson trailer back into yard fr driveway.  JFE/MEE (Granddaughter) test drv truck on Harris, drive ok: then goto 5922 to move Hudson. Shut mtr off to get key to rmv trlr lock.  When try to start mtr agn, NOT START!  Crank & crank, nogo!  @#$%.  

 

06/29/21  TUE  0930  153,409
Try diag start prob.  Fuel gauge reads over 1/2 tank, think maybe lying to me.  Try add gas first, frnt tank take no more than 2 gals.  Listen for pump run when turn on ignition, hear pump run for 2 sec.  Try start, it started but stumbled for good while then settle down.

Drove truck around the block, run ok.  Mv trlr into back yard, MEE pull trk into drvway.  Shut mtr off to put trlr lock bk on; when try to start mtr, same Crap - no start.  @#$% agn!

 

06/30/21  WED  0830  153,409
JFE try mv trk to 6715 Cedar (my home).  Mtr start but did 8-10 cycles where if hold RPMs at 2,000, mtr start to die but when pump pedal it picks up for another cycle.  Fin settle down, run ok.  Get trk home & park in front.

 

08/18/21  WED  1600  153,410  *NOTE THE MILEAGE HERE*
Start diag on truck fuel prob.  Use pressure gauge, see 50-55 psi at first, then drop to 0 psi in 4-5 seconds. 

08/19/21  THU  0900  153,410                                             Herko  P/O 3698  54.47
Order fuel pump fr Herko - P/N 070GE.  

 

08/24/21  TUE  TTTT  153,410
JFE help Scott Clayton (Chevy tech and friend) install fuel pump.  Did a test after inst'd by plugging off the pump output with the gauge b4 connecting the fuel line.  SC watched the gauge, sed it shot up to abt 90 psi then drop back to 50-55.  It held the pressure although the bleed down was more than the manual said it shud do - one minute test.  Five minute test was below specs also.  

***********
This test was done with only a very short hose on the pump output connection.  Is it normal for a pump to shoot to 90 psi then drop back to 50-55?  Later tests showed that the psi stayed in the 50-55 range.  Could this have damaged the pump?
***********

***********
The following may have been the beginning of the hydrolock issue.

 

09/14/21  TUE  1000  153,410
Truck parked in front of house.  Tried to start it for inspection, nogo.  Chk fuel del'y, see abt 50+ psi but then quickly drop off to 0 psi.  @#$%.  Next thing mtr not turn over; check btry volts when crank, drop to 4-5V.  @#$% agn.  Chg btry for 5-6 hrs - 12.75V.  Try crank, V still drop to abt 6v.  Then starter motor begin to sound bad - hear bendix hit but no motor turn.  Well, Shxx.  What next?  More!
***********

09/15/21 - 09/28/21  Much activity during this time, fighting both battery and starter motor problems.  NOTE: On 09/26 that was the last time the motor was able to be spun (on the 3rd try) after installing the 1st replacement starter motor.  On the 6th try the nylon gear in the starter motor stripped out.  That one is gone.

09/30/21  THU  1500  153,410
JFE inst new 2465145 starter motor (2nd replacement starter motor).  When try to start, volts drop so low the dash lights go out.  Quit.

10/04/21  MON  1300  153,410
Take Wlmrt btry to NAPA-Indep for test, rep sez fail.  Take it to O'Reiley's, rep sez good. 
Take Wlmrt btry to Wlmrt-Indian Trail.  Lady test it - *FAIL*!  Printout sez del 171 CCA out of 800!  They swapout for new 78N btry.  Inst new btry, motor still not spin over.

Tlk to Scott re mtr seems to be seized up.  S say pull all the plugs.  When pull the #4 cyl plug out, get a flood of gas with it when removed!  Hydrolocked motor.  Late, quit.

10/05/21  TUE  1030  153,410                      Rock Auto Parts  P/O ROCK3705  336.67/256.67 ? 
Use bore scope to look for gas, nosee any - Dang odd.  Chk to see if can hand crank engine now, works ok.  Then had KHE (wife) watch the #4 cyl while I got under trk to jumper the start solenoid to the hot post (did not want to use the ignition due to the 2 second pump run when cut on.  When did that, motor blew out a bunch of gas & got all over K and me!  (Her Powder Puff Mechanics 101 did not prepare her for that - she somewhat pissed!)  Not do that again.  Pulled the fuel pump relay & had K work ign.  K start 2X, see two clouds of vapor come out of #4 & #6 cyls.  @$#%!  K do it agn while J look at driver's side, nosee any vapor clouds.

 

Cl Scott Clayton, yak sit.  SC recommend repl all 8 injectors!  S sugg Rockauto.com.  Chk them find remans for $25-$29.  SC sez they're ok.  Sed get a new fuel filter also - abt $10. 

10/06/21  WED  tttt  153,410
JFE use long air wand to shoot air into cyls 4 & 6, no see any cloud come out of #4 but did get 2-3 blasts out of #6, then no more. 

 

10/07/21 - 10/13/21 
New injectors arrive.  My Chevy tech now unavailable so start process of learning how to replace the fuel injectors.

10/14/21 - 10/19/21
Start process of replacing the fuel filter.  Have a factory manual that gave wrong/incomplete info - only described a fuel filter mounted on the passenger side.  Mostly worthless for a DRIVER SIDE mounted fuel filter.  Check Chilton's, they just copy factory BS.  Report the issue to Chilton.  Did a post here, pick up new hints.  Got help, chg the filter.

10/20/21  WED  1400  153,410
Got smart & used a 5 gal bucket to drain the oil.  Got almost half a bucket out - 5 qts of oil & abt 5 qts of gas.  @#$%.  Inst new AC/Delco OF.  

10/21/21  THU  1130  153,410
Put in 5 qts of oil.  Reinst two splash guards.  Reinst spark plugs.  Start on fuel injector inst process.  Get stuff out of the way but hung up on removing the injector connectors.  Need more research.

10/22/21 - 10/24/21
Research removing injector connectors.  Fin find one video that helped.  It showed the keeper being completely removed before pressing button to release the connector but my version seemed to not want to be removed.  Swing top outwards, pull up to clear the button then press button to remove the connector.  Works.  Have not removed the conns, etc yet pending more info being  sought.

 

Now for the beginning of questions!

I am highly concerned about how that much gas got into the oil pan (est 5 qts).  Obviously a lot probably ran down past the rings.  

 

1A. But given that both cyls 4 & 6 had excess gas in them (4 flooded), are there TWO bad injectors?

 

1B. Is it possible that a hydrolock condition could damage the head gasket and allow gas to be forced from cyl 4 over to cyl 6?

 

1C. If the answer to 1B is 'Yes', then I reckon I should do a full cylinder compression check to see what is there, right?.

 

1D. What is best procedure to do full compression check - pull all plugs at once (less load on the starter motor) or one at a time?  What about the cyl 4 & 6 issue - same answer?

 

1E. Regardless of doing a compression check, would it make sense to squirt 1-2 oz of motor oil into both cyl 4 & 6 to help restore some lubrication on the cyl walls?.  Is 1-2 oz enough?

I am going to stop this post here for the time being until I get past the above issues.  More questions later ...