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Author Topic: Hitting a brick wall  (Read 7283 times)

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Kes

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Hitting a brick wall
« on: 18 October 2006, 22:17:08 »
To save me typing I cut n pasted from elsewhere .

Hi all last time I posted on this problem I took the majority of advice and changed the cam sensor but this did not solve it .

I will try to explain my symptons .

I know its been on here before By other members I am hitting a brick wall at 3750 rpm .

Firstly this does not happen when car is cold only when full operating temp is reached 85-90 on the temp guage .

I have even had the car on the drive warming up and freely reving past 3750 but once fully warmed up symptom is their .



I have cleaned the throttle housing and air sensor , I have had it on a mates tech test which shows crank sensor but have no probs starting car hot or cold . Another one was was some ring I think reluctor ring which is a gearbox (manual) off job but his mechanic mate said it will not be this .

AA mate thinks it might be a temp sensor not one for the guage but one for the ecu if their is such a thing .

Any thoughts gratefully received before I have to resort to a garage .

Tamuchly

Kes 2.5 V6 2000 mdl
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TheBoy

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Re: Hitting a brick wall
« Reply #1 on: 18 October 2006, 22:18:23 »
Any EML on?

If not, double check the multiram valves are working...
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TheBoy

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Re: Hitting a brick wall
« Reply #2 on: 18 October 2006, 22:20:42 »
Quote
AA mate thinks it might be a temp sensor not one for the guage but one for the ecu if their is such a thing .
There is, mounted alongside the gauge on on coolant bridge.

Are you near me (Northants/Oxon/Bucks border)?
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Grumpy old man

Kes

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Re: Hitting a brick wall
« Reply #3 on: 18 October 2006, 22:25:57 »
No eml on . I am up in Solihull .

Multi ram valves they sound purposful  :-? time to grab the Haynes . I have been living with this problem for nearly 4 months , I seem to be sort of be living with it as I run a motorbike which seems to empty my wallet . Through choice not cus its a bagoshite.
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Nickbat

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Re: Hitting a brick wall
« Reply #4 on: 19 October 2006, 00:03:55 »
Possibly no help, but when my coolant sensor went south I got terrible pinking (sounds like a load of marbles bouncing around the engine) when the car was under anything like a load - such as going uphill with a bit of wellie. The sensor sends the signals to the ECU and, much a like a choke in the old days, the ECU adjusts the fuel/air mixture. Relatively easy to change, but I would stress that it may not be the problem. As others have indicated, it could be the multi-ram valves.    
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Marks DTM Calib

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Re: Hitting a brick wall
« Reply #5 on: 19 October 2006, 08:38:55 »
Quote
I have cleaned the throttle housing and air sensor , I have had it on a mates tech test which shows crank sensor but have no probs starting car hot or cold . Another one was was some ring I think reluctor ring which is a gearbox (manual) off job but his mechanic mate said it will not be this .

Hes right, it wont be this because there isn't one!

Start with the multiram as its easy enough to check (info on what is what is in the maintenance area including a section on vac pipe routing).

I am assuming the air cleaner is clean and the fuel filter was changed recently to.

Blocked exhaust is what I am thinking.......
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miked

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Re: Hitting a brick wall
« Reply #6 on: 19 October 2006, 09:36:33 »
There isn't a rev limiter to go wrong is there?

Only a thought, not very mechanically gifted.

My CBR400 had one (jap import) which failed and it wouldn't rev past 8k.  Symptoms were like hitting a brick wall, which is quite frightening when you’re over taking something and it kicks in!

Sorry if this suggestion is a load of  [smiley=2vrolijk_08.gif]
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STMO123

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Re: Hitting a brick wall
« Reply #7 on: 19 October 2006, 09:46:21 »
Quote
There isn't a rev limiter to go wrong is there?

Only a thought, not very mechanically gifted.

My CBR400 had one (jap import) which failed and it wouldn't rev past 8k.  Symptoms were like hitting a brick wall, which is quite frightening when you’re over taking something and it kicks in!

Sorry if this suggestion is a load of  [smiley=2vrolijk_08.gif]

As far as I know, there isn't a rev limiter as such. But, there is a safety device which will come in if you go too high up the range. I think, only think, Its about 6500 revs.
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TheBoy

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Re: Hitting a brick wall
« Reply #8 on: 19 October 2006, 10:09:10 »
There is a rev limiter like most modern cars, but on redline.  There is another limiter if engine management detects a problem, this is around 4k (but EML will be on if this one is active).

I'd go along with Marks_DTM suggestions coz he's a clever geezer....  ;D
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Grumpy old man

The Barge Captain

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Re: Hitting a brick wall
« Reply #9 on: 19 October 2006, 13:57:29 »
What engine do you have?  When the crank sensor on my old 4 pot failed it was caused by the cable ageing - was ok when engine cold but when warm - NFG.  

Oh yeah - just read the 2.5 V6 bit at the bottom of your post
« Last Edit: 19 October 2006, 13:58:15 by The_Barge_Captain »
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Thou art no more an angel filled with light, but a leech to be abhorred and thou shalt suffer my burning will...

STMO123

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Re: Hitting a brick wall
« Reply #10 on: 19 October 2006, 14:15:34 »
Quote
What engine do you have?  When the crank sensor on my old 4 pot failed it was caused by the cable ageing - was ok when engine cold but when warm - NFG.  

Oh yeah - just read the 2.5 V6 bit at the bottom of your post

I would assume that fault could exist on either.
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TheBoy

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Re: Hitting a brick wall
« Reply #11 on: 19 October 2006, 14:35:52 »
A crank sensor is more likely to cause engine to stall, rather than rev limit...
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Grumpy old man

Kes

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Re: Hitting a brick wall
« Reply #12 on: 19 October 2006, 21:22:18 »
Hi all . The mega has fsh but not that I know if the fuel filter has been changed , air filter is ok .

I found some diags on the webb showing the secondstage mutiram at 3400rpm . I am also revising my brick wall down from 3750 to 3500 ish .

Would the multiram prob at 3400 be the same when cold as mine will rev freely till full op temp .

Is their a solenoid to check before the rams . If I need to replce do I need a 2nd mortgage or just 1 xmas pressie between both kids  :) 4 multirams .

Going away for a week so if I don't reply its cus Ime having fun  ;D
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TheBoy

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Re: Hitting a brick wall
« Reply #13 on: 19 October 2006, 21:24:19 »
could check if multiram is free when warm, in case its going sticky?
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STMO123

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Re: Hitting a brick wall
« Reply #14 on: 20 October 2006, 07:27:53 »
My multirams were'nt working (vac pipes all wrong) but it never caused anything like this. Just a bit sluggish.
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