Okay so I just recently purchased a 99 B20B from foreign engines and converted everything over to obd1 except for the injectors. My car is a 94 Integra GSR. After install i found that the MAP sensor and IAC were both fried so i replaced them. Also the dizzy I had was bad so i bought a new one. The original ecu i was going to use, 92 pr4, wasnt kicking the fuel pump on so i switched to a chipped po6. has stock gsr map.


SO now i am at my current problem...


It fires up everytime no problem but idles like garbage. it will bounce from 100/150 to 900 randomly or sit at around 1100 and drop/raise from there. it also has a slight miss throughout entire rpm range idling and under load. has strong spark and fuel to all cylinders. i pulled all the plugs and they were COMPLETELY black. i wire brushed them all and put them back in just to see if it would do anything. pulled them back out after running for 30 seconds and again, completely black. Also it smokes. TOUGH. the warmer it gets, the more it smokes...it is very dense and is white but doesnt smell like coolant. kind of like burning plastic... I ran it for about 20 minutes and took it around the block to get it to operating temp. It wasnt overheating and it isnt losing any coolant or oil. i figured as to how much smoke was pouring out the back the fluid levels would have at least dropped a little... If i could get ANY advice or insight into what might be the problem I would greatly appreciate it... Thank you

 

Try switching to a ls basemap.

 

well i ran an obd1 p72 in my old crx with a b20 just until i could find an ls ecu and it ran great beside the cel for vtec...

 

anyone?

searching everywhere and running out of ideas...

 

for your misfire, try pulling out one plug wire at a time, with the engine running. see which one doesn't make a difference. when you do, that's the cylinder with the misfire.
however, you should really run a compression test on it, since it's a new motor and all. it'll tell you a lot.

i have a feeling it's just moisture in the cylinders from sitting. that would give you white smoke and cause the plugs to blacken. just try running it for awhile. let it burn off. or the motor could have been sitting on it's side for a while. could have gotten oil in the cylinders. just run it and drive it. it may take a while to burn off. but get that compression test done anyways

 

misfire: when i had it running the other day i did pull each injector plug one at a time as with the plugs wires. each one made a noticable change.

so just moisture would turn the plugs black? they arent oily just a slight gloss when i pull them. a lot of black liquid does spit from the tail pipe..

i will try to get a comp test done soon tho. thanks for reply.

 

okay. you've got random misfiring. could be the plugs are fouling causing this. the black smoke is possibly unburnt fuel due to fouled plugs. if they're glossy, it's probably oil. altogether, since the motors been in, how much run time has it had?

 

Yeah I'm thinking it's the plugs that are cause it to run rough..

Altogether it has been ran for about an hour. No fluid loss what so ever.

Also smoke is not black just really dense white smoke. I checked timing with crank pulley and cam gears and they are perfect. Also checked valve clearance and intake is all between .005-.006 and all exhaust is .007 all within spec with no signs of damage. Also I did let the engine cool for 36 hours before I checked valves.

And when I pull the plugs all piston tops are completely dry.

 

does the exhaust smell like raw fuel?

the piston tops are gonna be dry regardless due to combustion

 

Closet thing I can compare the smell to is burning plastic.

 

so the tach, when it bounces, does it seem like it's reading engine speed correctly? or is it just bouncing randomly?

 

the tach is matching engine speed.

 

and the plugs, when you pulled them out, they were DRY and black?

 

Yessss. Power balance test! Do it son

 

....hrm. When converting an OBD II motor over to an OBD I chassis, swapping out alternator, injectors, distributor, and ECU is a must. You said that you didn't swap injectors? Why? your Distributor, is it new, or known to be good? spark plug wires in correct order? MAP and TPS plugs swapped? MAP sensor busted?

When buying a motor from anywhere that sells Japanese engines, it is possible you may have gotten a shitty motor. Just because it only has 30k-40k miles, it may have been a rough 30k-40k miles. Usually, most of the time, a motor isn't pulled from a car in japan and instantly sent over. The 99 B20 you picked up is well over 10 years old! It may have sat for 5 years on its head for all we know. Step by step, check, recheck, triple OG check. It maybe something as simple as a mouse stuck in the TB, or a plastic plug on the exhaust side. RECHECK EVERYTHING!!!!!! Good luck!

 

^^he says he converted everything to obd1.
obd1 and obd2 injectors are both high impedance. they should be alright.
op, have you checked the codes? timing?
as stated, if there is oil in the combustion chambers, it could take a long time to burn off depending on how much was in there. but then, it wouldn't really be white smoke.
raw unburnt fuel can cause white smoke, so i'm not ruling out the possibility that you're either running excessively rich, or not burning fuel adequately. especially since you're misfiring and the plugs are black. the plugs could be fouled causing these conditions.
check your codes and timing. and run a compression test. and get some new plugs in there. these are things you should be doing irregardless, any time you swap a motor.

 

Okay, so i have checked cel codes after everytime i start it and it always 21 for no vtec.

Plugs are dry and black.

Dizzy is brand new. i bought it from a friend who works at honda because he bought the wwrong one for his 91 integra.

Timing, both mechanical and ignition are dead on.

plug wires are brand new. i am using spark plugs from my previous engine because they only had around 50 miles on them. that and i would like to get them to stop turning completely black after starting so i dont have to replace them everytime i turn on my car..


So the thing is i am not 100% as to whether the smoke is caused by oil, coolant, moisture, too much fuel or a mixture. but with how much i have ran it, the coolant and oil are both at the same level.

And yes, i figure this motor was sitting for a WHILE being as it was their only higher comp b20 and it was on the very bottom pallet below all the new shiny p8r's..

 

Also, i have checked all wire colors to every sensor and they are all correct.

 

and the compression?

 

i should be getting a comp test done soon. just waiting for a friend to bring it by.

 

you could try running 91 and some sea foam or injector cleaner. maybe how long your fuel sat or bad injectors could be throwing it off. maybe nasty sludge in the oil pan??

 

oil looks a clean as it did when i put it in.

so i swapped out the injectors for a set of good b16 injectors(thought maybe one wasnt doing it job fully) and put new plugs in and it idles a little better but still smokes and misses.

And when i pulled the spark plugs to look at them, smoke was coming out of cylinder 3. smelled like exhaust/gasoline. so my question is, can exhaust get trapped in the combustion chamber like that? i fired it up and pulled the plugs 3 times and everytime, cylinder #3...

Im really just considering pulling the head off, putting a new head gasket on and changing out all the valves for a set ive already cleaned and polished.

i cant get a hold of the tools for a leakdown test or compression test.

 

dude, a comp tester is like under 10$