limiting at 6k revs even when warmed up

[lee-judge]

dunno whats up with car this time but its topping out at 6k revs even when its warmed up. any ideas what it could be??? :S

 

[Hutchie]

gearbox speedo sensor maybe...

 

[Dangerous_dave]

i have this exact problem with mine too. My aux belt came loose after a bolt disapered on the alternator bracket causing it to drop. which i 'think' maybe is causing a reduce charge from the alternator on vtec causing the vtec solenoid to get crankey and limit it.

need to replace this bolt and nut before i can tell you if this is the reason as i sheared it off when tightening it up with another blt and nut.

Take a look at the little threaded bolt thing that comes up vertically out of just infront of the alternator...
there should be no movement in this whatsoever.

if it is not this and you find it is something else please PM me what you find etc!

Cheers
Dave

 

[lee-judge]

i will check that tomorro. some1 said to check dogbone gearbox mount. i replaced top mount on fri but waiting 4 the lower 1. also em, tc, abs and service lights are all on

 

[Dangerous_dave]

i got service light on but thats because i have removed front seats (airbag sensors) no other lights on display...

 

[Icarus]

The ECU has lost vehicle speed input then, or rather more accurately one of the driven wheel speed sensors which the ABS and TCS also rely on to operate.

Cheers
M

 

[lee-judge]

the lights came on when i had new gearbox put in. will they just be fault codes that can be deleted?

 

[f0xy]

Exactly whats happening to the 172 engine in my Mk1, my ECU isnt getting a speed reading that it needs as said (various problems), and my limiter is at 6k exactly..

 

[lee-judge]

its doin my nut in. funny thing is when gearbox went in it would rev all the way that was about 2 month ago but it only started doin this last week

 

[Dangerous_dave]

The ECU has lost vehicle speed input then, or rather more accurately one of the driven wheel speed sensors which the ABS and TCS also rely on to operate.

Cheers
M

could this be caused by a loose aux belt ? obv not desirable and will be rectified asap.

 

[Will.]

i have this exact problem with mine too. My aux belt came loose after a bolt disapered on the alternator bracket causing it to drop. which i 'think' maybe is causing a reduce charge from the alternator on vtec causing the vtec solenoid to get crankey and limit it.

need to replace this bolt and nut before i can tell you if this is the reason as i sheared it off when tightening it up with another blt and nut.

Take a look at the little threaded bolt thing that comes up vertically out of just infront of the alternator...
there should be no movement in this whatsoever.

if it is not this and you find it is something else please PM me what you find etc!

Cheers
Dave

Vtec?

 

[Dangerous_dave]

Vtec?

when revs get to vtec ...i 'think' lack of charge / malfunctioning aux belt is causing the vtec soleniod to sulk...

 

[Will.]

Oh i see. I always thought vtec was just a honda thing lol. Learn something new everyday

 

[f0xy]

its vvt solenoid, variable valve timing. not vtec.

 

[Dangerous_dave]

so do you think this s causing my car to limit at 6k or something to do with sensor on gearbox?

 

[lee-judge]

also my stop light flashes sometimes. my car is really s--t at the mo!!!!

 

[Dangerous_dave]

also my stop light flashes sometimes. my car is really s--t at the mo!!!!

think this might happen when the battery is fukd..or related electrical problem

 

[lee-judge]

not battery had it replaced about a month ago.

 

[Dangerous_dave]

loose / dirty connections Earth connection on mine caused that prob once.

 

[lee-judge]

i think i will just go thru everything tomorro. something has gotta work

 

[Dangerous_dave]

any more ideas people?......................................... bump

 

[Munson]

The variable valve timing (roffle at vtec) kicks in y0 at something like ~1500rpm. Nothing electronic or mechanical happens at the ~5k 'changeover' and even if it did, that would be closer to 5,000rpm. That's how I understand it anyway. I may be wrong.

 

[Russ_16v]

Roy your spot on, the VVt on the Clio comes in at circa 1600 rpm to help low speed driveability, the 5k kick is simply when the engine is working at its most efficiant revs

 

[Russ_16v]

oh and vtec ( which stands for Variable valve Timing and lift Electronic Control) operates like this:

Instead of having one cam lobe per cylinder, you have 3, and you also have 3 rocker arms. The two outer cam lobes are smaller than the middle one,Now at low rpm the middle rocker arm is not locked to the two outer rocker arms and in effect not used, and the two outer rocker arms operate the valves as per any normal engine. When you reach the rpm that the vetc operates, the ecu via oil pressure shoots a metal rod through the rocker arms, locking the three together. By doing this the middle rocker arm is now being operated by the middle, larger cam lobe which means as all three rocker arms are locked together, the larger centre cam lobe mkaes the rocker arms hold the valves open for longer

a vid to show:

http://www.youtube.com/watch?v=iZc-SNs7Sag

Which is completely different to VVT, which adjusts the cam timing, nothing to do with the valves, the only Manufacturer to use V-tec is honda as they invented it

 

[Will.]

oh and vtec ( which stands for Variable valve Timing and lift Electronic Control) operates like this:

Instead of having one cam lobe per cylinder, you have 3, and you also have 3 rocker arms. The two outer cam lobes are smaller than the middle one,Now at low rpm the middle rocker arm is not locked to the two outer rocker arms and in effect not used, and the two outer rocker arms operate the valves as per any normal engine. When you reach the rpm that the vetc operates, the ecu via oil pressure shoots a metal rod through the rocker arms, locking the three together. By doing this the middle rocker arm is now being operated by the middle, larger cam lobe which means as all three rocker arms are locked together, the larger centre cam lobe mkaes the rocker arms hold the valves open for longer

a vid to show:

http://www.youtube.com/watch?v=iZc-SNs7Sag

Which is completely different to VVT, which adjusts the cam timing, nothing to do with the valves, the only Manufacturer to use V-tec is honda as they invented it

Thats what i thought. LOL

 

[Dangerous_dave]

ye you know what the f**k i meant ...god damn haters

 

[powey]

Think guppy changed coolant sensor as it was thinking the car was still cold

 

[Russ_16v]

yup could be coolant temp sensor mate, worth a try ?

 

[lee-judge]

took my car to garage today to see if they knew what it was. when it came to takin it on a test drive em light went off and now its runnin fine wtf!!!