Multiple Misfire after mini Rebuild. - Chevy Impala SS Forum
 
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post #1 of 4 (permalink) Old 03-20-2017, 04:08 PM Thread Starter
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Multiple Misfire after mini Rebuild.

KK Random Multiple Misfire

Note Had Random Multiple Misfires BEFORE rebuild as well!

New:
Timing chain (dot to dot)...
Spark Plug
Spark Plug Wires
Made Looms and routed and protected all spark plug wires. Including #7.
Autozone Opti
Cleaned Injectors All working New Orings for them
O2's
Oil Pump
No Vacuum Leaks

Sluggish to turn on. Puffs of white smoke. But def not coolant... Turned car over before filling it with coolant just to see if opti was good was...white smoke was present then, still is but less white smoke now but still random multiple misfire.

Did a fuel pressure test:
Fuel Pressure goes to as I turn the ignition to the on position 10-18-25-35-41 and does not hold pressure. Have redone this test multiple times, Now the pressure only increases to 10 while I put key on the on position but still cranks itself and turns on. When I start the car it slowly increases to 41 on constant acceleration. If I remove the vacuum line to the regulator shoots up to 51. On idle multiple misfire code, when accelerating CEL flashes. The more I rev the more white smoke there is. Help Took a video of the gauge meanwhile I was accelerating. As pressure starts to rise to 41 CEL flashes. Help get this thing on the road!

If anyone has gone to Mexico, thats what the white smoke smells like... Like regular emissions of several cars... Not like gas or anything but like a ton of emission.....

Last edited by NoobDaily; 03-20-2017 at 04:27 PM.
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post #2 of 4 (permalink) Old 03-20-2017, 06:19 PM
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An engine that is burning an ungodly amount of fuel will have white, foul smelling smoke. Fuel pressure not holding is a good clue that something is jacked up in your fuel circuit

Regarding the CEL - plug the car up and pull the codes. The car wants to tell you what's wrong.


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #3 of 4 (permalink) Old 03-21-2017, 12:25 AM Thread Starter
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Quote:
Originally Posted by atlantadan View Post
An engine that is burning an ungodly amount of fuel will have white, foul smelling smoke. Fuel pressure not holding is a good clue that something is jacked up in your fuel circuit

Regarding the CEL - plug the car up and pull the codes. The car wants to tell you what's wrong.
Hey! Thank you, thank you. I did pull the codes, the only thing is multiple misfires. I went to grab an entire fuel assembly hopefully that will fix it. If it doesn't... I'll ask a good mechanic lol. Will inform if it helps.
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post #4 of 4 (permalink) Old 03-25-2017, 03:54 PM Thread Starter
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For anyone with problems with surging multiple misfires and prolong start times. I really suggest inspecting your fuel pump!

I changed the fuel pump assembly completely and solved my random multiple misfire problem along with the other things.

I misdiagnosed this with a bad opti so curiously I bought a 43$ opti just to see if this would solve my problem and it did not. I will post later to see how long the 43$ opti lasts, but will go to a delphi opti once this one goes bad, for now if you have the problems I have had please check your fuel pump!!! Car runs like a ****ing champ now even with the $43 opti lol lets see for how long! Thank you for all of your help!
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