austin man
|
| posted on 16/6/09 at 08:55 PM |
|
|
zetec revs rising and falling
Problem with a 2 Litre zetec running Emerald ECU. with following sensors, crank, airtemp and water temp.
When revs held at 1500 rpm the revs fluctuate between 1000 and 1500 when throttle pedal is held in same position also occuring if held at 2000 rpm.
Have checked the fuel system pressure regulator, pump and filter all appear okay. Ideas please gents
Car is undriveable in low rev range but pulls like a horse above 2k rpm
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
|
|
|
|
|
coozer
|
| posted on 16/6/09 at 09:02 PM |
|
|
Mine hunts a little bit if I drop the idle below 1K.
I found fine balancing of the carbs helped a little bit, and I suspect there may be a little air leak at the idle.
[Edited on 16/6/09 by coozer]
1972 V8 Jago
1980 Z750
|
|
|
austin man
|
| posted on 16/6/09 at 09:06 PM |
|
|
This is bordering on dangerous when you attempt to drive off the revs drop off then wallop they rise to about 2500 rpm car will idle at 1000k no
problems. when running at higher revs seems sweet as a nut ?????
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
|
|
|
paulf
|
| posted on 16/6/09 at 09:14 PM |
|
|
It may be a bit weak on the low rev bins or the throttle enrichments need adjusting.Is the throttle sensor in good condition as it could be giving a
rough signal at small openings.
Paul.
|
|
|
Benzine
|
| posted on 16/6/09 at 09:19 PM |
|
|
air leak somewhere at the inlet manifold?
|
|
|
austin man
|
| posted on 16/6/09 at 09:19 PM |
|
|
engine has been running fine for pat 3 years, mapped by Dave Walker himself, the TPS is a hoda Blackbird item as the carbs are being used as throttle
bodies is the tps known to be poor. We have looked at the unit it is a sealed item
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
|
|
|
austin man
|
| posted on 16/6/09 at 09:21 PM |
|
|
if it was an air leak the car would be running erratically even on tickover wouldnt it as said previously if you lock the revs at 1500 the revs drop
then rise. The duratin between rise and fall is constant ??
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
|
|
|
ss1turbo
|
| posted on 16/6/09 at 09:43 PM |
|
|
Do you have closed loop lambda on yours? It could be that kicking in. Causes could be anything from a dodgy sensor upwards..
Might be worth a call to the man himself?
Long live RWD...
|
|
|
grazzledazzle
|
| posted on 17/6/09 at 08:05 AM |
|
|
I had this on a 2 litre zetec with dta. Turned out to be knacered TPS. They can mask problems quite easily. If it is a jenvey type TPS they can be had
at rs components for a lot less money.
|
|
|
rusty nuts
|
| posted on 17/6/09 at 06:48 PM |
|
|
Had similar symptoms with my car when I first got it running with the Emerald ECU or rather after about 20 miles. Turned out to be the TPS, ended up
refitting the bike one and have had no problems since.
|
|
|
.jpg)
.jpg)
.jpg)
