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Revs Hunting 2000-2500

hunting hunt revs 2000 2500 high fuel power loss

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#16 DOINEEDAFOCUS1.6MK1

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Posted 07 February 2014 - 08:24 PM

Hi, My Focus Mk1 1.6 has only one lamda sensor pre-cat. Checked out yesterday on a snap on large diagnostic handbag thing costing way too much & requiring a gaolers size ring off pcb's for all manner of vehicles, simply stated NO faults detected, no codes logged.

I however am having a similar experience whilst in the workshop difficulty in obtaining a smooth steady acceleration through 2500 - 3500 rpm.

Air leak or something I suspect, so I don't think lamda will be your cause. I will be watching this thread to see if anyone can come up with a definitive answer. Just though my problem * having only one lamda sensor * might contribte to a solution by someone.

 

:wub:



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#17 tigacatch

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Posted 07 February 2014 - 09:17 PM

I might want add that my son is a mechanic and he also checked it with some fancy garage equipment and told me that no faults where found. My backround is more as computer assembly test and process opetator field thanks to sun microsystems lol But me being me I don't trust mechanics much and even less diagnostic machines !!! That why I invested in a cheap £20 reader of ebay myself and diagnosed it with an android app called "torque" via my android tab. As said before no faults found !! But upon researching the subject on how exactly these sensor work I have learnef to utilize the android app via a chart reading of the sensors (lambda) this appeared to reading sensor 1 ( pre cat upsteam) going up and down in the charts 0.5 - 1 volts aprox as its increasing and decreasing fuel load but bank 2 sensor 1 post cat downstream holding a steady voltage (1.2 approx)" no flux in readings. I personally would expect a similar reading as sensor 1 as I suspect this to be the most important one especially because after cat with co2 emmisions !!! As for fault codes not appearing I suspect because I still have voltage (complete circuit) the CPU thinks all is okay. BTW this is all an educated guess on my behalf. Also regarding vacuum I have disconnected the pipes an plugged holes on pipes and stuck pressurised air in it to test it and all okay. No fall in pressure. You can also do a smoke test to check for leakage " cost nothing" lol Replacement of my sensor delayed to next week to to weather forcast. Hate this weather haha

#18 tigacatch

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Posted 07 February 2014 - 09:26 PM

Just for your information I was using a elm533 Bluetooth interface ( eBay) and the torque app ( playstore) on android to get a reading of sensors and not some £1000 crappy diagnostics machine. Total cost to me £25 pmsl

#19 InKontrol

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Posted 08 February 2014 - 04:24 PM

Hi Steven,

 

Hopefully this will assist you in diagnosing whether the O2 sensors are dodgy...

 

I'm subscribed to EricTheCarGuy on YouTube and he's been a big help in understanding various faults with a car, touch wood I've not had any faults so far.



#20 soulman123

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Posted 08 February 2014 - 09:38 PM

Snap me to, he seems crackers but he's a genius!

#21 jeebowhite

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Posted 11 February 2014 - 05:23 PM

got a good website too:

 

http://www.ericthecarguy.com/



#22 tigacatch

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Posted 08 August 2014 - 03:37 PM

Quick update, had my mot the other day and failed on emissions test. Needless to say they where testing it at the problem revs and trying to get a decent reading at around 2000-2500. Engine just burning to much fuel. Also now has developed an engine fault. Cylinder 2 and 3 misfire, also engine management came on at 70 mph in 5 gear at around 2300 rpm. Another surprise there haha. So far I have had spark plugs replaced, leads, knock sensor, coil pack and vacuum hose at intake manifold, idle control valve. Problem still the same :-(
Car still running underpowered, smelling of fuel, cylinder 2 and 3 misfire and hesitant at 2000 to 2500 rpm :-(

#23 tigacatch

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Posted 08 August 2014 - 03:39 PM

Quick update, had my mot the other day and failed on emissions test. Needless to say they where testing it at the problem revs and trying to get a decent reading at around 2000-2500. Engine just burning to much fuel. Also now has developed an engine fault. Cylinder 2 and 3 misfire, also engine management came on at 70 mph in 5 gear at around 2300 rpm. Another surprise there haha. So far I have had spark plugs replaced, leads, knock sensor, coil pack and vacuum hose at intake manifold, idle control valve. Problem still the same :-(
Car still running underpowered, smelling of fuel, cylinder 2 and 3 misfire and hesitant at 2000 to 2500 rpm :-(

#24 mjt

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Posted 08 August 2014 - 04:02 PM

Hi Steven,

Although you say you've changed plugs, leads and coil packs I feel that it's interesting that, having a wasted-spark system, cylinders 2 and 3 will be sharing a coil and I wonder if this might be significant or just coincidental.



#25 tigacatch

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Posted 08 August 2014 - 04:46 PM

Was thinking the exact same. Definitely everything been changed. Next on my list is to check the injectors by swapping them all around to the if it would still be the same cylinder faults

#26 tigacatch

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Posted 08 August 2014 - 04:47 PM

What's really pee ' ing me of that all problem are to only a specific rev range. Just so weird.

#27 tigacatch

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Posted 09 August 2014 - 03:35 PM

Well tried out new vacuum pipe today and that little white valve for the vacuum too but no luck. I did however notice that when I disconnect the vacuum hose the revs increase to about 2000 rpm and pressing the throttle would gradually increase the revs. The problem at 2100 rpm disappearing. Nice and smooth. However I can't drive it with the vacuum hose disconnected. Some kind of vacuum fault somewhere else. The map sensor works with vacuum too. Maybe that at fault? Disconnected it and started engine but problem still there ?

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