Having problems with h22a in accord power flattens at 6,000 RPM.

[Luke Accord]

Hey boys and girls got a problem with the engine in my accord it's a h22a from 1994 prelude and i had it on the dyno the other day and heres what happened.
It was making nice power just before vtec came on, when vtec came on (5200 RPM) you can see the power rising but as it hits 6,000 RPM the power flattens out and runs horizontal until 8,000 RPM then rolls off. Anyone have any suggestions or ideas as to why this is happening any advice would be greatly appreciated.

Thanks Luke.

[ECU-MAN]

when you drive it can you feal it.


could be leads or dizzy cap

if your runing a P13, other than code 20, do you have any other codes in the ECU.

[Luke Accord]

Car feels perfectly normal when driving until you hit vtec you can feel the initial power burst then it just maintains itself without increasing. Haven't checked the codes yet will do in the next few days.
Thanks Luke.

[Luke Accord]

Checked for codes today but there was none.
Anything else you can think of?

[CUL8R]

cheap headers / dodgy exhaust may not be flowing enough gas out of the engine. e.g high rpm = more fuel = more in need of free flowing environment

[Luke Accord]

cheap headers / dodgy exhaust may not be flowing enough gas out of the engine. e.g high rpm = more fuel = more in need of free flowing environment

Still have the 4-2-1 stock headers and a brand new 2.5 inch system with hi flow cat. But maybe the stock headers are holding it up what do you think? Now thinking of a h22a type s engine to replace the h22a.

[aaronng]

Above 6000rpm when it is flat, do you get excessive black smoke?

[Luke Accord]

Above 6000rpm when it is flat, do you get excessive black smoke?

Not much black smoke we were thinking that there was a problem with the engine getting enough air but everything seems to be working can't really think of anything else.

[Benson]

time for a new motor :p

[pornstar]

Luke did it ever run like normal before this?

If it did, then something has changed. Look first at your oil level, you wouldnt believe how many people dont do this check.

[Luke Accord]

Luke did it ever run like normal before this?

If it did, then something has changed. Look first at your oil level, you wouldnt believe how many people dont do this check.

Nah the oil is fine i get it changed every 5000 km's.

[aaronng]

When was the last time the fuel filter was replaced?

[Luke Accord]

Not sure about fuel filter. Just thinking of upgrading throttle body intake manifold and headers do you guys think this will help. I've been told that there is no point upgrading these because no internal work has been done and i can see where they are coming from but surely upgrading all these parts should gain some power.

[EuroDude]

PErhaps the valve tappets need adjusting. When my mech dodged up my tappet clearances, I was getting more power down low but terrible power up high.

Or maybe the engine has lost considerable cylinder compression. Have you done a compression test?

Water in the spark plug holes can also cause problems at high revs, also check the Spark Plug wires for bad resistance using a multimeter

[Eclipsor]

Not sure about fuel filter. Just thinking of upgrading throttle body intake manifold and headers do you guys think this will help. I've been told that there is no point upgrading these because no internal work has been done and i can see where they are coming from but surely upgrading all these parts should gain some power.

I think if the problem is like you say it is then it should be performing better than this in its stock state. You should be looking at testing for simple problems like ecu man has suggested rather than upgrading major parts. The stock parts should be perfectly adequate to get a more normal looking dyno if they're all working properly.

[Spoon-Accord]

check the VTEC solenoid. probably gaked up?

or change leads and plugs. maybe the dizzy cap and point inside if u can..

see how that goes .. ohh check timing :P

[Luke Accord]

PErhaps the valve tappets need adjusting. When my mech dodged up my tappet clearances, I was getting more power down low but terrible power up high.

Or maybe the engine has lost considerable cylinder compression. Have you done a compression test?

Water in the spark plug holes can also cause problems at high revs, also check the Spark Plug wires for bad resistance using a multimeter

Not sure about tappets. Compression is fine had it checked a couple of weeks ago. No water in the spark plug holes and the leads are fairly new.

[Luke Accord]

check the VTEC solenoid. probably gaked up?

or change leads and plugs. maybe the dizzy cap and point inside if u can..

see how that goes .. ohh check timing :P

VTEC solenoid is working fine. And the leads and plugs are fairly new and the timing is correct. Thanks.

[Spoon-Accord]

is the carworking fine now?

[Luke Accord]

is the carworking fine now?

I'd say its still the same i haven't changed anything and i haven't driven it. It's been getting resprayed and getting a new front bar and sideskirts.
Thanks for asking. I'll let you know when i get it back.

[Luke Accord]

Got the car back a couple of days ago still the same, but brand new paint job and new front bar and sideskirts looks faster lol. Probably going to get a set of aftermarket headers and see if that helps. but not really sure what else it could be. What type of power would you expect from the h22a?
Cheers.