Injector test good but still white smoke

[Matt cardwell]

Sobinjad the same problem a knock and white smoke on the start everyone has a guess we'll these guesses cost me over a grand to find out that my number 6 injector was not tightens equally. Tightens it the right way and poof no more knock no more smoke

 

[Lebo]

Update to this thread. I was looking over my injector test paperwork about a month ago and I noticed one injector result was way off compared to the others. I showed it to the shop owner I was using (good guy) and he agreed but it was too little too late. My problem was why did I have to find this. I paid 350 for the test and I was told the injectors tested good which didn't make any sense and made my decision to replace them very difficult. Also, I made the decision to buy 6 new injectors based on bad information. I only had one bad injector IMO. Only one stood out. All the others looked roughly the same. The paperwork was right but no one looked over it throughly. I expected the tester or the shop owner to find this. I guess it was on me.

For those of you who have never had an injector test the results are either green checks for in-range or red x's for out of range. However, if you have anything over stock injectors you have to expect some numbers to be off because, for example, stage one injectors will flow more than a stock injector. So, IMO you need to compare each of your injector results to the other to try and find any discrepancy. One of my injector numbers really stood out in comparison to the other injectors but... they all had a red x next to them in that category because they were 60hp over injectors. But one was way higher in comparison to the other and that is how I determined it was the bad one. This is just my opinion. I don't do this for a living but it makes sense to me. The truck told the story but I needed the test results to back it up before spending $$$ more on injectors. The test results did but I was relayed bad information IMO.

As far as my other thread on the P1223 code, I believe the P1223 code was a combination of two issues. Since the P1223 code started happening consistently after the new injectors I contribute that to the connector tubes torque being 1/4 to 1/3 low each. I believe the rail pressure issue was always there and mainly a result of a weak CP3. That's my best guess. New CP3 and re-torqued connector tubes and the codes are gone and truck is running really smooth empty. I hope that is it but it still seems under impressive towing so I am addressing that next week.

 

[p-Bar]

Did your mechanic cap on the the rail relief valve on the rail?

 

[Lebo]

P-bar, I know he put in a solid/race plug in place of the pressure relief valve.

 

[p-Bar]

I know it was obvious but I had to ask. You are now certified injector expert.

 

[cerberusiam]

I know he put in a solid/race plug in place of the pressure relief valve.

That is a BIG no-no, get a new PRV before you work the engine.

 

[Lebo]

Ceberusium, O yeah, it was just to rule out the PRV as possible leak. It is no longer in the rail. Thanks

P-Bar, A lot of times I think I am right but later find out I am wrong so I hope what I posted does not steer anyone in the wrong direction. I have had a two sets of injectors tested and basically they just hand me the test and say here ya go. It has been up to me to figure it out which surprised me.