B18a1 swap

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Npavao

New Member
Hey guys so the backstory I've got a 92 civic cx swapped in a b18a1 and ls trans engine has hbeam rods super tech low comp. Pistons with new rings, new rod and main bearings new plugs and wires and a turbo.... Trans has new clutch and flywheel. Used the factory cx harness everything is hooked up where it should go I've checked the timing about 4 times....

The issue I'm having is it idles extremely low and rough, when driving between shifts it idles high and the higher rpm I shift the higher the rpms are between shifts..... It also back fires when pushing the gas pedal over 1/4 way to the floor... Coolant system is bled all vacuum lines are hooked up and new as well so there's no cracked hoses....

Definitely appreciate any help or opinions on what to check as this is my first dohc engine.
 

TurboMirage

That’s how you get ants
VIP
Hey guys so the backstory I've got a 92 civic cx swapped in a b18a1 and ls trans engine has hbeam rods super tech low comp. Pistons with new rings, new rod and main bearings new plugs and wires and a turbo.... Trans has new clutch and flywheel. Used the factory cx harness everything is hooked up where it should go I've checked the timing about 4 times....

The issue I'm having is it idles extremely low and rough, when driving between shifts it idles high and the higher rpm I shift the higher the rpms are between shifts..... It also back fires when pushing the gas pedal over 1/4 way to the floor... Coolant system is bled all vacuum lines are hooked up and new as well so there's no cracked hoses....

Definitely appreciate any help or opinions on what to check as this is my first dohc engine.
best advice i could give would be to check the timing lol jk

the rpms going up between shifts really sounds like a vacuum leak somewhere. how are your intake and throttlebody gaskets? get some dish soap and water in a sprayer and spray gasket surfaces and watch for bubbles.
 

Briansol

Admins
Admin
VIP
We need some more info to understand the set up--

Did you convert to obd1?
what ecu are you using?
did you convert the o2 1 to 4 wire?
did it run this way before turbo?
what tuning software are you using?
was it dyno tuned?
 

Npavao

New Member
best advice i could give would be to check the timing lol jk

the rpms going up between shifts really sounds like a vacuum leak somewhere. how are your intake and throttlebody gaskets? get some dish soap and water in a sprayer and spray gasket surfaces and watch for bubbles.
I'll definitely give this a shot!! Thank you!
 

Npavao

New Member
We need some more info to understand the set up--

Did you convert to obd1?
what ecu are you using?
did you convert the o2 1 to 4 wire?
did it run this way before turbo?
what tuning software are you using?
was it dyno tuned?
Sorry! It is converted to obd1 I've got a phearable p28 with a xenocron basemap chip for the engines specs the o2 sensor is not currently hooked up but it is the 4 wire the engine was put in with the turbo previous engine owner said it ran fine but it was in pieces when I got it and put all the parts in it I currently only have datalog capabilities and it has not been dyno tuned yet trying to get it to run right before finding a dyno as the closest one to me here in iowa is 4 hours away
 

Briansol

Admins
Admin
VIP
yeah, if the o2 is unplugged, it could account for all those symptoms
 

dilbeckskate

infamous
id check valve adjustment , and the distributor may be too far retarded/advanced
 
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