ok i am sooo frustrated with my car right now... a couple weeks back i did my 00vi swap and two of my injectors were dead so i ended up driving around like that for a bit until new injectors came and i finally replaced the injectors i could see puddles of gas in those two cylinders. now that i put it back together the power is back! but my gas milage is still horrible and there is sooo much smoke coming from my car. how long will it take to burn that gas out?

i thought about pulling the fuel pump fuse and keep starting it... or even removing the spark plugs from those 2 cylinders and bump starting it... i really dont want to pull off the IM i dont feel comfortable sticking stuff into the cylinders to suck it out...

 

Why would you pull the SP'? Seems as if you would want to burn that excess fuel out, and you need spark to do that.

Also, were the injectors dead when you installed? How do you know? Did you repalce the o-ring when reinstalling the new (to you) injectors? Were they seated properly? What is your MPG? Do you know your AFR? What color is the smoke? How do you know there were puddles? You could see through the head ports?

 

puddles of gas = no spark. not a fuel problem. check the coils and plugs for starters.

 

This is how I killed my 30. How were the injectors dead? If they were stuck open, then the rings on those cylinders are fried and compression is low. The smoke can be attributed to this as oil is now blowing by the rings. Do a comp check. Moral of the story. Never drive on messed injectors.

 

when we first did the swap we swapped coils with my 4th gen coils and the car sputtered the same way and also i unplugged each coil to see if there was an idle change and it didnt change on those two cylinders which narrowed it down to those two injectors. when we removed the injectors from the rail they were bone dry. when we looked into the heads we saw the gas from there.

i was thinking that if it removed the spark plugs from those cylinders and tried bump starting it would force the gas out. it would be messy but it might clear the gas out... what do you guys think?

the smoke from the exhaust is white/gray and it smells extremely rich... i mean rich that it make your eyes water when you are outside of the car. my MPG is about 10 miles per gallon

 

might be the plugs and not the coils then. if you flooded the cylinder they might have fouled out the plugs. its worth it to look into it.

 

yeah but before my car ran extremly sluggish and wasnt too much smoke but since i replaced the injectors the power is back with a lot of smoke... if the plugs were fouled out then the power would still be gone and it wouldnt be burnin all that smoke right?

 

if you take out the plugs from those cylinders, you can look at them to see if they are fouled, then you can run a comp check, then you can crank it with them out and if there is gas in there, much of it will come out. put a white paper towel over the hole so you can inspect what comes out and check for oil. even if there is oil, you probly wont be able to tell unless there is a ton unfortunately.

 

Ok here is a summary of how the installation went:

Car is already equipped with a 96 TS ECU in a 98, only problem I see is that the set screw has no stops(completely broken).

VAFC Install - Ran car on USIM - car ran perfectly

00VI Install

2000 Lower with Swirl valves removed and sealed off(JB Weld).

DEK Injectors, o-rings lathered with some oil to help seal nicely.

DEK Upper Manifold

• Brake booster plumbed as normal(passenger most vacuum port
• Smaller center vacuum valley used for fuel damper, EVAP solenoid, and FPR
• Larger center Vacuum valley used for PCV (Large Vacuum leak, yet to be fixed)
• Port above TB used for IACV Adapter
• Port closest to Firewall beside TB, used for EVAP

2000 TB, Block plate used for IACV; sealed with silicone. Using supplied TPS.
2000 Valve cover, new gaskets were used; PCV supplied used.
Fuel Rail routed damper side (closest to front Valve cover) to Top of Fuel
Filter(Brand New 300zx filter); FPR side to the gas tank.
Coolant lines rerouted directly back into Coolant log 4" after exits top coolant passage.
====================================

Installation;

Everything USIM was removed and replaced with DEK equipment. Install went rather quick and car was started up. First noticed extremely rough idle with a slight mist of smoke from the exhaust. Drove it around for about a mile and rough idle was displayed throughout the RPM range. Parked car and removed the VI to check what was happening, didnt find anything out of the ordinary.
Reinstalled VI and smoke slowly dissipated but rough idle was still there. Time was cutting short so we swapped coil packs between DEK and DE's with no change. We established that it was an injector problem as no change was apparent when removing the coils. He had to go back home (3 1/2hr drive) so we thought it would be best to take the trip like this but gas mileage would be extremely terrible.
Finally got a chance to make my way up to his place, after he had ordered 350z injectors.(same Part # but ran at higher PSI in Z). Installed the injectors and to my amazement a plum of white smoke began to erupt from the exhaust pipe enough to cloud up the neighborhood rather quickly. Shut off the car, removed VI, and realized the solder on 2 injector harnesses came apart and i resoldered them. Installed everything again and still the same problem with large amounts of white smoke. Removed the 350z injectors and reinstalled the DEK injectors but the unusual problem was now showing its face with the DEK injectors..
Tried several other methods to find the cause of this but had no real solution to this new problem. On side note when I removed the VI- Lower to install the Z injectors i noticed a very fuel conjested cylinders 5-6.
Completely stumbed as to what it could be.

 

hey luke i have seen this more than once and actually i just had it happen on my motorcycle.. check the vacume line that is coming off of the fuel pressure regulator,, the regulator can go bad and then stright gas will dump into the engine and cause the problem like i said it is rare in 8 years i have seen it 3 times but it can happen and it is easy to check!!!!! let me know talk to you soon

 

Something very similar happened in my car as well.

DF

 

found the two spark plugs were fouled on those cylinders and there is much more power restored. Will be checking over the other spark plugs shortly

 

yeah the 2 plugs were completely wet fouled! will try to get AFC tuned and vaccum lines fixed tomorrow

 

If you're going to get an AFC 'tune' what are you doing for AFR monitoring?

 

i am going to get it dyno tuned

 

From what I understand it turns out the whole problem was coming back to being a faulty TS ECU for a 96 in a 98 Maxima.