my buddy just put in a jdm f22b1 in his 95 lx accord and he is running in to problems i have done research and so has he but the things that people have done to correct the issues he is having doesn seem to be working the issues are it does go over 5000 rpm and there is no vtec and the idle jumps up and down he has the ecu for a 95 ex accord it could be a bad ecu we are just running out of ideas so any help would be awesome please help and thanks in advance

 

Any CEL codes?

Did you wire VTEC to the ECU? dumb question but had to ask.

Idle issues,
Did you test for vacuum leaks, bleed the cooling system?

Your kind of leaving it wide open when you say that you've tried some things that others have but don't tell anyone what you've tried.

 

sorry but yeah we hooked vtec up i dont think he checked for vacuum leaks or bleed the system but the idle doesnt start jumping until the car is warm and it got a new iac on it he's got two codes but they didnt come on until he put the internal coil distributor on the motor befroe that there were no codes but we just cant figure out how to get the vtec to work and to get the car to go past 5000rpm

 

when he put the old distributor back on the codes went away and he did check vacuum and he bleed the system so i dont know what else to do neither of us has done this swap before

 

So if you go for a drive and rev the car up to 5k does the CEL come on or does it just stop like you hit a rev limiter? The OEM ECU has a two trip detection method. It needs to see the error twice in order to set the CEL.

Take the car out for a test drive and take it up to 4k in first gear. Hold jsut above 4k rpm in first for a few seconds. Stop the car, shut it off. Repeat this test drive two more times. Does the CEL come on after doing this? If it does it will probably be a DTC 21 or 22 indicating something wrong with the VTEC solenoid or pressure switch.

 

nothing comes on after driving it a few times when driving it the car pulls good to 5000 rpm and after that it just doesnt have any more go to it it feels like is straining it just doesnt have any power past 5k

 

could be a fuel issue or it couldbe that the F22B1 doesn't really make much power after 4500-5000. Do you have any engine mods I/H/E?
F22B1
Hp is rated 145 @ 5500rpm
Tq is rated 147ft-lb @ 4500rpm
8.8:1 compression ratio and a VTEC that starts to engage between 2300-3200rpm.

 

yeah the car has intake and motor back exhaust its not a power issue its more like the car struggles or isnt getting the fuel it needs i mean when the gas pedal is floord the car doesnt want to do anything its wierd it wont even go to 6000k

 

sounds like a bad ecu... I had a friend that had the same exact problem turns out it was the chipped ECU that was the problem...Try installing another ECU from a OBD1 Accord Ex and see where that takes you...Me and my friend also tested a stock P28 (which is really famous for being chipped) on the F22B1 motor and found that VTEC picks up pretty nicely @ 5000 rpm...Just a suggestion though...

 

sweet thanks ill try that and i was wondering if the p28 ecu would work might have to try that also thanks

 

If you do suspect fuel system and you have access to a pressure gauge. You can check the fuel pressure at the rail if you have a pressure gauge.

Idle psi FPR vacuum disconnected = 38-45psi
Idle psi FPR vacuum connected = 30-37psi

Usually when an ECU goes bad there is a CEL indicator. The CEL is not always indicating the ECU as being the problem. All it may indicate is that one or more of the circuits have failed. That is when all the testing fun begins.

If you have access to another VTEC ECU that does make the testing much faster.

 

thanks for info and good idea we willl check fuel pressure tomorrow and we are goinng to try a new ecu also tomorrow

 

ok last night my freind tride a new ecu and changed the wiring harness and he is still having the same problem wont go over 5000k and there is no cels

 

anymore ideas

 

Witch is it? Won't go over 5k rpm (cuts out/rev limiter) or It doesn't have any pull/lose of power after 5k rpm (doesn't cut out)?

Can you post up a video of what it is doing? A video would help out to see exactly what the car is doing when it hits 5k rpm in all gears.

Have you checked the fuel pressure? or any other parts of the fuel system.

 

lose of power over 5k rpm in every gear dosent cut out and we checked the pressure and the pressure is good i will try to get a video up asap

 

my buddy tried a p28 ecu and that didnt help the issue either another friend told me that we should clean the vtec solenoid and that there might be a wiring issue i am just so confused about this car i have no idea anymore i am lost

 

If it were a wiring issue there should be a CEL for that particular circuit failure. But you say no CEL. I'm still thinking that it is only an F22B1 and you and your friend seem to feel that it should run like an H22A or B16B. It's not a DOHC VTEC built for speed. It's a SOHC VTEC that is built for economy. This is why I would like to see a video showing how the car is performing up too 5K.

The F22B1 redline is 6250 isn't it?

How much power do you think it should be making after 5K rpm?

 

i understand that its a sohc cam but it is going into limp mode at 5k and yes i do know the difference between a dohc and a sohc there is a big difference

 

You said that there was no CEL, how do you know it's going into limp mode? If it was in limp mode the ignition and fuel would cut (rev limit) @ 2k - 2300 rpm...... Limp mode does not cause you to loose power @ 5K rpm.

 

thats what it feels like

 

my f22b1 in cb is doing this too, but it is because i dont have the correct ecu yet. and i dont have a CEL either.

i think there was a way to check the vtec solenoid to make sure it is engaging. jumping it straight or so. also remove the solenoid and clean the mesh underneath it maybe its clogged.

i dont think it matters which wires go to where for the vtec straight to ecu, one is ground and the other is power. you can try reversing them just to be sure.

i had a b16a and when i had tightened the idle screw to tight, not letting enough air in, the motor would redline/limit @ 5k with vtec not engaging. loosening the screw to allow more air in fixed my issue.

 

The TPS being out of adjustment could also cause this type of problem. Or the MAP sensor

Check the voltage between the signal wire (RED/BLK) and the sensor ground (GRN/BLU)

Closed throttle = approx. 0.5v
Wide open throttle = approx. 4.5v

 

we didnt even think about that but we are going to lok at that that today i really appreciate all your input so far hopefully we can fix this thing soon