So need help guys I got a 97 civic hatch with a b18c, has a intank fuel pump don't know what type, but also has built top end cams springs ect... Car also has a vafc. So when accelerating in first all good till I hit vtec and right when it hits vtec car jerks like sputters for a sec. then keeps accelerating then I shift to second gear then car jerks back and forth and rpms go up and down while motor accelerates for 2 to 3 seconds. Then in third gear car has major hessatation in vtec. Idk wtf but I checked the timing the plugs changed the injectors to 270cc, the spark plug wires are new. I have a aem wideband and at idle car runs at 12.5 12.6 so I know it's rich and under acceleration runs at 11.0 11.5 so that's pretty rich but plugs are ok not fully black. No CEL but when I ground the plug to set timing the CEL reads 21 vtec solenoid but idk why it's not on when the car is running normal but any info would be nice thanks!

 

Try cleaning or replacing the solenoid gasket/filter.

Also Ohm test the solenoid and its wire.

 

Ya I checked the gasket 2 times, I'll try do a ohm test... When I do the ohm test what should be the reading so I'd know if it's ok??

 

Bump anyone?? I'll try post a video it's very strange.

 

Built top end but have you had it tuned?

 

I had this exact problem with my itr swap turned out my solid mounts vibrated one of my grounds loose and I cooked a p73 ecu somehow. Cranked the ground down and changed ecu and no more problems

 

No there is no place to tune here, no dyno... Sucks.

 

I'll try check my grounds thursday.

 

checked all grounds all good

heres a video i took its at idle runs rich and when reving the car right when it hits vtec it sounds like a 2step bbut the more throttle you give it clears up idk and look at how rich it runs when it sputters. at wide open throttle it runs that rich on the wide band and and feels like the car is defiantly holding back power in vtec.

 

it needs tuning. Simple as that

 

I agree with that to a point that it's mostly all stock.

 

Just go an get your crx back

 

hahaha ya i feel like that at times... that car ran perfect.

 

Ok well first you should figure out what was done to the bottom end. I know the car and I know it has mods to the block. It could even have a b16 crank in it. the guy who built that motor is famous for dumb stuff like that. He goes too low of compression every time. There's an ls vtec with the same problem as your car an now the guy wants to sell the motor. Good luck an you should have just boosted the b16. Could have done it for around 1500

 

Oh yeah an try adjusting the vtec way high like 6500 or 7000 an see if it pops

 

who built the motor?? whats his name?? and i did a compression test and its over 190 over all cyl. so i know the block is good just dont know what parts are in there lol.

 

I think he works at Maui Toyota not sure of his name I can try an find out. You should call an ask the guy you got it from what EXACTLY was done to the block. Trust me it will help you trouble shoot the problem. I will keep trying to help you figure it out as best as I can.

 

ya i did ask him what was done to the block and said just lower comp pistons but he didnt sound to sure, if you can find out that would be very helpful... if not you know anyone with a b18c bottom end lol.

 

I'll keep an eye out for a stock Gsr block. It sucks having no dyno here if you could get that car tuned I bet it would be pretty fast. I'll call a freind tomorrow and see if I can get the guys name that built the motor. That's funny the guy didn't even know what was done to the block, bet he spent allot of money on that car.

 

well dropped the oil pan today and checked the crank and its def a b18c gsr crank with stock gsr rods... what was a relief. So i guess its just lower comp pistons. But would be nice if i new exactly what pistons are used. so probably needs tuning witch we have no dyno here so i gotta street tune for now. But still dont make sense why my car has this problem.

 

Ok so talked to my friend today he said car NEEDS to be tuned. Try adjusting the vtec high see if it enguages. Car has low comp pistons don't know what kind he didn't specify.

 

What's the guys name?? Who did you talk to?? Ya I'll be getting hondata soon. The vtec def works I can hear it and on the controller it says it's on it's just that it's very weak in the rpms. Oh and is this joe by the way?? Lol.