OK, here's my list of engine mods. Any of these known to cause a fuel cutoff at 6500-6600 rpms? Maybe the ignition if there's something wrong with a wiring connection or something?

My car feels good until I get to 6500 and it's starting to get annoying. I have VTEC and the only light I get is EGR which shouldn't affect fuel cutoff, right? I'd have to say no as I used to rev above 6500 with the same codes...

I have an 88 Prelude that was originally odb0. I've used Place Racing's conversion harness (it's a mess though...whoever did the wiring before...well I'll leave that alone!) to convert to OBD1.

JDM H22a swap via Place Racing mount kit, harness and axles
Thermal Research & Development Catback
Ferrea Titanium Competition Valves
Walbro Intake 255LPH Fuel Pump
Crower Spring & Retainer Kit
P&P & 5 angle valve job
B&M Fuel Pressure Gauge
USDM Pistons (10:1)
Crower Stage 2 Cams
DC Sports Header
AEM Cam Gears
AEM Fuel Rail
MDS Ignition
Crower Rods
AEM FPR
VAFC
CAI


EDIT: Stupid place racing supplemental harness. Dang VTEC Solenoid wire wasn't even connected. So even though the ECU and VAFC where saying they where turning it on, the engine was never getting the signal to do so. It's a whole new beast of an engine now!


Modified by Daily Interlude at 2:14 PM 12/29/2004

 

TTT

Any ideas?

 

OK, I don't think it's the ECU doing the fuel cutoff (atleast not in the limp mode sense). I say this because it revved up to 6900 before it cutoff this morning. Now I did put gas in it (about 8 gallons from being on empty). Maybe I'll fill her all the way next time and see if it's any different.

There had been a few times the vtec controller said it revved to 6600 or so but I thought it was just because of the engine still accelerating even though the fuel was cut (momentum) but this morning I shifted at 6700 and didn't feel any cutoff so I let her rev to the max and the vtec controller said 69xx so I don't think it's trying to run in limp mode cause doesn't limp mode force it to cut at 6500 all the time?

 

sounds like your not hitting vtec, or your in limp mode. Check all your wiring again, check and make sure your VSS sensor is hooked up and your speedo is working(dont know how the h series works ) . If your not able to rev past 6500, that sounds like limp mode or your running on the locam setting. hows your vafc working, what year is the motor? unfortunetly, i thik ive talkedto you before about the wiring thing, you might just want to bite the bullet and REWIRE the car correctly, i had to do the same thing. its easier to diagnose stuff when everythings wired right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VtecKiDD &raquo;</TD></TR><TR><TD CLASS="quote">sounds like your not hitting vtec, or your in limp mode. Check all your wiring again, check and make sure your VSS sensor is hooked up and your speedo is working(dont know how the h series works ) . If your not able to rev past 6500, that sounds like limp mode or your running on the locam setting. hows your vafc working, what year is the motor? unfortunetly, i thik ive talkedto you before about the wiring thing, you might just want to bite the bullet and REWIRE the car correctly, i had to do the same thing. its easier to diagnose stuff when everythings wired right</TD></TR></TABLE>

Speedo works.

How does the lo cam thing work? Will the lo cam not rev past 6500 at all? I don't feel much power (never did) above 6500 rpms.

But, I thought that VTEC kicks in. The VAFC is showing on for both the ECU and itself (Vti and Vto are both showing on on the VAFC). Is there something on the backside of the VAFC (and/or ECU...between them and the motor) that could affect rev limit? Oil pressure sensor or something similar? It's weird though as the ECU is telling it to engage vtec too so it wouldn't be low oil...

You're probably right on the rewire though. Thing is that they used the Place Racing conversion harness. I may just uninstall the VAFC and see what happens. I'd trust the place Racing conversion harness better than the vafc wiring (some wires aren't soldered...they where just taped when I got the car but I've gone back and used electrical connectors on those connections). Maybe soldering would make the difference?

 

Stupid place racing supplemental harness. Dang VTEC Solenoid wire wasn't even connected. to me and to place racing's wiring harness! The wire can just slide right out of it's connector!

So even though the ECU and VAFC where saying they where turning it on, the engine was never getting the signal to do so. It's a whole new beast of an engine now!

Taking it to the track is going to be fun when it opens!

 

bump!

I have the exact same problem. The car runs good except it cuts off at 6500-6600rpms. Only code is EGR. I'm running a JDM P13.

Any other suggestions???????

 

You sure it's really getting VTEC? You have a VAFC? If so, put the engagement point higher so that you can really hear/feel it!

My problem was with the swap kit...the harness in particular. The VTEC wire came out the back of the harness so I wasn't getting any high cam at all...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daily Interlude &raquo;</TD></TR><TR><TD CLASS="quote">You sure it's really getting VTEC? You have a VAFC? If so, put the engagement point higher so that you can really hear/feel it!

My problem was with the swap kit...the harness in particular. The VTEC wire came out the back of the harness so I wasn't getting any high cam at all...

</TD></TR></TABLE>

Yes, I can feel it and hear it. It does not hit as hard as it used to but it comes on. Then it falls on its face around 6500-6600 rpms.

 

My friend has the same problem, its stock with just bolt-ons...its fast and all (13.1 on slicks in a EG) and we DO hear and feel the VTEC but it cuts off right before 7000 RPM also. CEL is only EGR, But he runs a P30 right now. I dont know if the P30 is better or not since we never tested it, but it feels the same and he can rev to 8000... We never figured out the problem.....

 

That sounds like rev limit. Maybe your ecu is not getting a good signal from your temp sensor? It won't rev over 6500 if it's cold. I have the VAFC so it still engages VTEC when it's cold but the ecu cuts off there.

Check for situations like that. The speedometer is another one.

You have a A/F gauge?

 

I do not have a af gauge. On my dash it does display when the car is warm. It still does not rev over 6500rpm. No vafc. Speedo seems fine. Any other suggestions???

 

bump!

 

post a picture of that SLEEPER....

 

If you're referring to my car, here's a few pics (click)...

 

My friends car is warm...and he has a AF Gauge and its running right...The VSS is working but ill check out his car ...

*nice sleeper...