Alright, I have 4th gen prelude with an H22A1 motor. I am having two problems. If anyone can be of any help, that would be GREAT!

1) The speedo isn't working and it throws the speedo engine code.

2) Not hitting vtec and hitting the rev limiter at 6.5k rpm's.

I am pretty sure those two problems are unrelated. VTEC and normal engine rev limiting were working after the speedo broke. I am pretty sure I know how to fix the speedo sensor. But what about the VTEC, low rev problem??? What could possibly be wrong? Any opinions would be awesome!!

Thanks in advance,
Jeff

 

I know VTEC on H22s will delay or sometimes not even kick in if your oil pressure is too low. Check you oil to see if you have enough. The speedo is problably the sensor. Have you taken out your gauge face lately? Messed with the computer?

 

Oil is good, the speedo is assuredly the sensor. I know how to fix that. Its the vtec not kicking in that is relaly confusing me! Anyone else?

 

as always, triple check your wiring and make sure that there are no other codes....it has to be up to normal operating temp also...until it's been running a few minutes, it won't hit vtec.....it's probably wiring....u using the USDM p13?

 

Yeah, but I haven't changed anything... Why would the wire randomly go bad?

Thanks for the input guys,
Jeff

 

Did the VTEC problem correspond to the speedo code?

 

Nope, it happened about 3-4 days after the speedo was already broken... Any ideas? I wan get this fixed.

Thanks All!!

 

make sure the engine is warmed up and then try to hit vtec. if the car is cold, vtec won't engage and redline will go down to 6500 rpm's. for the speedo problem, check the wiring. that's all i can think of.

 

Thanks for the info, but even after having been running for an hour it sitll does it

Any more ideas?

 

Its got to be the speed senser.. Vtec will only work if the ECU sees that the car is going faster then 19 MPH.. And if the senser is not working, the ECU thinks your not moving..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Cottonwoodz &raquo;</TD></TR><TR><TD CLASS="quote">Its got to be the speed senser.. Vtec will only work if the ECU sees that the car is going faster then 19 MPH.. And if the senser is not working, the ECU thinks your not moving..</TD></TR></TABLE>

You are sure about that?? So anyone know what I should do? Get a new speed sensor from Honda? Thanks for all the great help guys!

-Jeff

 

speed sensors aren't cheap. $210 for a new one in my legend from the dealer.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pyrochaos38 &raquo;</TD></TR><TR><TD CLASS="quote">

You are sure about that?? So anyone know what I should do? Get a new speed sensor from Honda? Thanks for all the great help guys!

-Jeff</TD></TR></TABLE>

yes it's in the helms.

4th gen conditions:
1. Engine Speed 4,900 rpm or higher
2. Vehicle Speed 19mph or faster
3. Engine Coolant 140F or higher

 

try another ecu...?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Cottonwoodz &raquo;</TD></TR><TR><TD CLASS="quote">Its got to be the speed senser.. Vtec will only work if the ECU sees that the car is going faster then 19 MPH.. And if the senser is not working, the ECU thinks your not moving..</TD></TR></TABLE>

Yes! WE ARE 100% SURE!!!
I had the same **** happen to me a week ago!!!
https://honda-tech.com/zerothread?id=620738

I used JB WELD AND SONIC WELD. Sounds Gettio But so far so good
Vtec will not work if you speedo doesn't.

 

Sweet, I'll give it a try this weekend! Thank you all so much for the help!!

-Jeff

 

I had exactly the same problem on mine. I had taken it to the honda dealer to have a new distributer fitted. While it was there they topped up my oil but used a mineral oil. The motor had fully synthetic in it. After a couple of days, the Vtec would not cut in and the motor would rev out to the limiter. I drained the oil used engine flush, fitted a new filter, refilled with good fully synth. The VTEC is now functioning correctly. I think the main thing about the VTEC is the oil as it is activated hydraulically. Hope you get it sorted.

 

Yea fix the speed sensor then see if your vtec still isnt working.... As I always tell my friends when I'm working on their cars... One thing at a time......

-Jeff-