After purchase of dap 7x.0010 injectors and quad I'm having idle issues first time put in gear. 99 auto stock hx35 cai 4" mprp big loap will stall if grid heater is active. Smokes when grid heater is active and in gear. If I double pedal to back out I'm fine. Once in gear im fine until I put in park again. then same problem. I've completely removed quad ran on zero ran on 3 with timing changes. No change. Ran wire tap with ZERO SMOKE all settings. After researching alot on here I assumed I needed the quad to turn can bus fuel down on no to low psi for smoke control. I'm stumped. any advice. thanks

Stock stall converter. fass set to 14 psi. hits 15 when bucking in gear. 12 min at wot

Apps is in spec vp is reman 3 years ago. Trans has 30k on stock rebuild. 221k on stock injectors. no problems until new injectors 

Tightened tubes to 28 ft lbs hold down 89 inch lbs. No change in oil height. Quick bleed started in 5 seconds after bleeding. 

So I got the injectors back today. When I Originally called and explained my symptoms and asked what pop pressure they were set to I was told they were set to 310 when I called. Spoke with dap Friday to check on status. Was then told they all tested within 9 psi of each other witch was still in spec but they lowered a bit and should help. Get them today with test results and they all tested 289-299 range and now there set to 290? Stated on test sheet ac problem,programmer problem,or weak vp. I told them I had a ac bypass belt on. Vp is reman and I had disconnected the quad. no problems since swap. Is 290 ok? Seams a little low to me. Thanks. 

293 bar is 4250 psi which is minimum by Factory Service Manual... Stock is 310 bar which is 4500 PSI. Then the upper end is 327 bar which is 4750 PSI. 

Thanks @Mopar1973Maninjectors re installed yesterday ran out of daylight primed and started up today. initially installed primed up in like 30 seconds after installing. This time it took about 5 key bumps to get fuel  to cylinders  1 3 4 and 5 to start. Same symptoms. Maybe my vp is getting weak after bigger injectors. 

@Mopar1973Manquick summary. Bought the truck mid winter. started really rough and smoked until warm. Noticed the battery guage didn't drop when grid heater solenoid clicked. Bought it for a decent price. Sure enough the grid heater solenoids were bad. 75$ later truck was turn key. 30 k on rebuilt trans stock stall converter have the paperwork. Had slight idle haze and could smell the unburnt fuel. Driving there was no smoke good pedal response. 217k on stock injectors 1 owner truck. so I bought the dap 7x.0010 dap vco injectors. Quadzilla adrenaline. Bd stealth cover. installed all at the same time. Quad on stock setting just to see fuel pressure. fass titanium 165 gph fuel is fine. 150 injectors no smoke on stock tune. Even removed quad. no smoke driving like I stole it lol. And obviously now loping idle wanting to stall only when put in gear for the first time unless I put in park and put in gear again. Going to take it to work tomorrow and just turn it right up for the first time and see what happens. a stock truck with 150 injectors should have some smoke. Maybe being at sea level and building my own true 4" Id intake gives enough air? Vp is reman 3 years as ago maybe getting weak? Maybe bd stealth cover tap screw over tightened? I have 12.3 volts. Any more insight would be appreciated. Alot of good help on here. Thanks again. 

My 7x10 vco are still smokeless at idle, I asked DAP to set them at 320 bar back when I got them. I never tried running them without the quad to see if they smoke under load. I'm guessing with my turbo and 7x10s I'm probably in a good ballpark where they wouldn't smoke much. 

I'm also set for 320 bar on 7 x 0.010 injectors. Smoke free till the wire tap hit then a poof and clear again. Also running HX35/40 hybrid turbo (60/60/12).

We modified the nozzles to be clean and give good power.  150HP injector nozzles flow about 80% MORE fuel than stock.  

Edited April 30, 20213 yr by dieselautopower
added "More" to correct statement

6 hours ago, dieselautopower said:

We modified the nozzles to be clean and give good power.  150HP injector nozzles flow about 80% fuel than stock.  

Can you elaborate a bit please

@DieselfutureI to would like @dap to elaborate on that. I was told by dap that I would have to start fuel trim at 85-90% at 0psi to stop smoke. But 150 injectors only flow 80% of fuel vs stock injectors? Definitely banging my head right now. 

@DieselfutureI'm not looking to roal coal every where I go. Want a clean powerful daily. at this point I'm wishing I kept stock injectors and just put the quad in. Just want to figure out why it wants to stall when put in gear. It's not the tc. Barely any engine load sitting still in gear. If I get on the skinny pedal quick after putting in gear I get one quick buck then all the power is there. If I just put in gear and hold breaks it lopes bad. Let off the break it starts jumping rpm up and down until I give it gas then it settles out. Thanks 

@DieselfutureMaybe I should start fuel at 120% if there only pushing 80% vs stock lol.

I'm pretty sure they left out the word "more"... As in flow 80% more than stock.

Corrected the statement above.  

 

EDM + Honing and some mild tip mods give good performance with the trade off of very little smoke.

I get a slight haze when started and first put into gear (I run with grids disconnected).  Once warm no haze.  I also get no smoke unless I get on it with the quad turned up and then only a puff of black then away I go... 

 

When I first installed the 7x010 injectors I was worried that if I lost my quad that the truck would smoke like a train but driving around normally there is little to no smoke with the quad on 0.  I have no lope and no issues with these injectors.  When I bought mine I did new bodies and new cross-over tubes.  I wanted to ensure I had zero issues after installing and so far so good. 

On 4/29/2021 at 5:19 PM, Cummins1401 said:

@DieselfutureI to would like @dap to elaborate on that. I was told by dap that I would have to start fuel trim at 85-90% at 0psi to stop smoke. But 150 injectors only flow 80% of fuel vs stock injectors? Definitely banging my head right now. 

@DieselfutureI'm not looking to roal coal every where I go. Want a clean powerful daily. at this point I'm wishing I kept stock injectors and just put the quad in. Just want to figure out why it wants to stall when put in gear. It's not the tc. Barely any engine load sitting still in gear. If I get on the skinny pedal quick after putting in gear I get one quick buck then all the power is there. If I just put in gear and hold breaks it lopes bad. Let off the break it starts jumping rpm up and down until I give it gas then it settles out. Thanks 

@DieselfutureMaybe I should start fuel at 120% if there only pushing 80% vs stock lol.

I honestly think 320bar with 7x10 vco from dap is where it's at for street friendly injectors and mild turbo. 

Not sure what is going on with your truck and why they lowered your pop pressure. Possible weak vp  I really don't know, I love my set up and it works great, although my truck almost killed me today. I'll start another thread on that.