2L diesel swapped 1986 4Runner (3 Viewers)

[4Ruster]

I think I may have found my problem. We all know Toyota basically used Bosch VE pumps. Aparently there is an off boost adjustment. I bet this is why my throttle feels so weak down low or when the pedal is barely pressed.

I don't see a screw on the compensator, perhaps it's under the cover?

 

[4Ruster]

I said screw it and put my altitude compensator back on. Feels much better now that its not cutting fuel. Right now I just need to drive it around for a bit and seat the rings.

I did a compression test last weekend dead cold:
1- 270
2- 260
3- 320
4- 360

Then I took it to the end of the road and back, only got up to 140F:
1- 400
2- 400
3- 420
4- 420

Bit of smoke at startup but goes away pretty quickly, a bit of haze when driving but overall just needs some good heat cycles to break in.

I can finally sit back and take a deep breath.



The hard part is over. My bank account is slowly healing. I am finally at peace. Tractor noises. Putaputaputaputaputaputaputaput.

 

[4Ruster]

I have a feeling my tiny 1 7/8 exhaust may be hindering some performance and holding the EGTs up. What would you guys recommend for exhaust sizing? I just plan to go straight to the rear with a muffler above the rear axle.

Do these engines sound good with chambered mufflers like the gassers?

 

[GTSSportCoupe]

I have a feeling my tiny 1 7/8 exhaust may be hindering some performance and holding the EGTs up. What would you guys recommend for exhaust sizing? I just plan to go straight to the rear with a muffler above the rear axle.

Do these engines sound good with chambered mufflers like the gassers?

2 1/4 " exhaust has been great for me. The biggest restriction is the dump pipe, so buy a flange and fab a better one if you really want some gains. Above all, I found intercooler to make the biggest difference to EGT though.

 

[4Ruster]

Alright here is day 4 of driving the 4Runner around. I first replaced the exhaust with 2 1/2 piping and a better flowing muffler. Bit of drone but overall EGTs dropped about 200°.

8 seconds of glow and fires right up on all 4. No smoke on fire but I get a white haze until I drive it a bit.

There’s a constant haze while driving I can see in the headlights behind me. Also it’s very easy to blow black, the only way to accelerate it will blow for a few seconds as the RPMs go up. No turbo still. I might get all the injectors pop tested and see if maybe they’re not popping at the right pressure.

Power feels decent but it’s more of a switch, I’m either barely putting along, or I’m accelerating and smoking out everyone behind me. I was able to reduce this slightly by turning the fuel screw in about 1/8 of a turn, though the black smoke gets thicker so I don’t want to go anymore. I’ve yet to raise the EGTs above 900° which is weird because before I could easily get it up to 1100°.

I get a bit of injector rattle when cruising, I’ve tightened the dynamic timing spring a little bit and that helped but it’s still there. Maybe it’s advancing too early and that could be the cause of my black smoke too(?).

Biggest issue right now it it appears my thermostat is stuck open, or my mechanical gauge died, because the 20 minute drive to work doesn’t even get the needle to 100°F. Though I do have heat. It’s weird. I’ve ordered a new Toyota thermostat.

 

[4Ruster]

Hmm. Added half a bottle of diesel lubricant last night. Driving to school today I’m noticing a lot more white smoke and the idle went up 150RPM. Noticing a bit more injector rattle, possible got some funk in the injectors….again….

 

[4Ruster]

Grrrrrr so driving around it’s just puking black smoke when I try to accelerate meaningfully. I can’t even get the temps up past 900° it just rolls coal and the power drops. Going up the hill to my house I switched from 2nd to 3rd to hold 2000RPM and it was ROLLING black to the point it sounded like I lost a cylinder. Driving on flat I kept the pedal in the same spot and out of nowhere I gained the cylinder back. I couldn’t even hear the injectors at all. Made it home but grrrrrr this truck is pissing me right off. Injector rattle is barely audible.

 

[4Ruster]

At this point I may as well just put a 22re back in

 

[4Ruster]

I just had a thought. It seems to only really smoke at lower engine speed. I'ts possible the dynamic timing curve is off, and when I throttle it up in low RPMs, the advance kicks in faster then the engine can handle. Would make sense with my starting out and free revving too. From my understanding way too advance can cause smoke too. I might add some tension to my dynamic timing spring adjuster.

Anyone else who has this adjustment screw, could you take a picture and show me how far in yours is? I know the pump body is set up for a turbo, so possibly it kicks the advance up early to spool the turbo quicker?

I dunno my brain is much from helping my friend move out all day, just got home at 11PM. Time for bed.

 

[aztoyman]

Generally speaking, too much advance on a diesel can give you black smoke. (Partially burned fuel) And low EGT's. Lower boost.

Retarded (Late) timing can give you white smoke (unburned fuel vapor) going out the pipe, higher EGT's if it's still burning on the way out and higher boost.

Before anyone jumps on me, remember I said "generally" and I'm referring to TOO far advanced or retarded. I'm just trying to get @4Ruster's head around what needs to change to dial this in. Maybe SMALL adjustments, take notes and give it time before another change.

I mentioned in an earlier post to run good filters because you need CLEAN fuel. Make sure there is no air in the fuel system or you will chase your tail. Maybe contact a Toyota diesel specialist or shop online and get some advise. Maybe you have the wrong pump for your application. I can sense your frustration.

I hope you get'r dialed in.

 

[4Ruster]

Generally speaking, too much advance on a diesel can give you black smoke. (Partially burned fuel) And low EGT's. Lower boost.

Retarded (Late) timing can give you white smoke (unburned fuel vapor) going out the pipe, higher EGT's if it's still burning on the way out and higher boost.

Before anyone jumps on me, remember I said "generally" and I'm referring to TOO far advanced or retarded. I'm just trying to get @4Ruster's head around what needs to change to dial this in. Maybe SMALL adjustments, take notes and give it time before another change.

I mentioned in an earlier post to run good filters because you need CLEAN fuel. Make sure there is no air in the fuel system or you will chase your tail. Maybe contact a Toyota diesel specialist or shop online and get some advise. Maybe you have the wrong pump for your application. I can sense your frustration.

I hope you get'r dialed in.

hmmm okay thanks I do appreciate the advice

Here's a video of me driving normally, the smoke on starting from a stop seemed to go down a bit after I turned the fuel down 1/4 turn.

Maybe this amount is normal and I'm just overthinking everything.

 

[aztoyman]

It's not "rolling coal", doesn't sound bad. How is it for starting, idling and power? How are your EGT's? No turbo yet right? My 6.7 Cummins will puff more than that when I first hit the throttle. My 6.7 EGT only runs about 800 going 80 on the freeway. If I'm pulling my travel trailer up long grades in AZ heat I think I saw 1400 after a long pull but not for very long.

I'm sorry I don't really have more to offer for help. I never had a Toyota diesel so I don't know what normal is for them. The positive side of all this frustration you're going through is that you are really going to learn a lot about this engine. The jobs that kick your a$$ the most are the ones you really learn from. You're forced to learn all the finer details and you'll never forget them.

 

[4Ruster]

I hold the glow plugs for 8 seconds and all 4 cylinders fire on the second or third turn. No smoke on initial fire but I get a white/blue haze after a few seconds that will clear up once I take off.

I'll have to get a video tomorrow going up a hill. EGTs are around 400-500 when cruising, 600-800 when pulling hard. No turbo correct.

 

[4Ruster]

I know I posted the video in the other thread, but what do you all think about how slow the revs are to drop and the smoke?

 

[aztoyman]

I just Googled "Bosch VE pump slow return to idle" and found a few posts about it. Some say it's normal, some say not but I guess some are worse than others too. I never had one of these engines so I don't know.

Watching your video it seemed to drop faster when you moved the throttle linkage by hand under the hood. Any chance your cable is dragging a little? Maybe put another or stronger return spring on the linkage?

It doesn't seem that bad to me but it obviously has your attention. The smoke seems normal to me, it sounds pretty good and your temps don't seem out of line. How does it run and feel to you? Does it seem to have good power?

Maybe check out some of the diesel forums regarding the Bosch pump you have. Good luck with it. I hope you get it dialed in.

 

[KiwiDingo]

I know the pump body is set up for a turbo, so possibly it kicks the advance up early to spool the turbo quicker?

It's the opposite. If you want to spool the turbo quicker you retard the timing which gives the turbine more heat.

 

[4Ruster]

I just pop tested all my injectors, heres some videos.

 

[4Ruster]

 

[4Ruster]

Okay so factory service manual states pressure should be between 2148 and 2262 PSI.

I ended up swapping springs and shims from my old injectors as they popped within spec. Now the new injectors pop between 2000 PSI and 2250PSI. I'm not sure how much variation I can have but I assume if theyre all in spec then its fine. As for the one popping at 2000PSI, the only shims I had would raise the pressure to 2500PSI and above so I guess I'll just have to order a new shim online and live with it for now.

As for the spray pattern.

I'm really hoping I was just pulling the handle wrong, because these are new nozzles. If I have a certain amount of pressure you can see they spray fine, but if I'm too light I get a stream, and if I'm too heavy it doesn't shudder, just comes out uninterrupted.

Stuck them in the truck and it seems to run fine, sounds to same to me haha. Guess we'll have to see when I go for a drive.

 

[KiwiDingo]

I just pop tested all my injectors, heres some videos.

Those two are bloody terrible