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#1621554 - 08/06/2018 08:27 Another weekend of 16v injector light misery ahead
BBR Online   sleepy
Club member 1435 - Membership
My life on the forum

Registered: 15/05/2011
Posts: 1531
Loc: Hemel of the Hempstead
So yet another weekend will be spent by me taking something else off the car to see if I can diagnose the injector light.

Car not running lumpy at all in fact sounds and runs like a dream 99% of the time - but emissions (CO only) too high, very rarely stutters when pulling away, cold idle set to 600 having turned the brass screw which results in slightly elevated warm idle at 900 ish, but if I bring the warm idle down to 750-800 with the brass screw cold idle cannot be sustained and have to use accelerator to keep car alive when cold.

Maybe there is an air noise like blowing under acceleration which I do not recognise in my 20vt - but when I say blowing it is more like a faint poofing noise whose frequency increases with revs.

startrek still says lambda and cam sensor faults with both having been replaced.

Checked/replaced so far: -
Plugs
Leads
Cap
Rotor arm
Filter(s)
Map sensor pipe
All induction pipes
Catalytic converter
_________________________
16v NA Blitz Blue

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#1621568 - 08/06/2018 14:26 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3444
Loc: Pothole City
If it's still flagging sensor errors after the sensors have been replaced and errors cleared then I'd suspect the wiring to the sensors, or grounds, or the ECU itself, or maybe even dodgy new sensors. Just cause the sensors have been replaced doesn't mean the problem is gone if the errors are appearing again.

Is the 16v perhaps different from the 20v where a cam sensor error doesn't cause a non-start but causes the ECU to inject fuel on exhaust and compression strokes just to get the engine running?

ECU faults are very rare but strangely I just had a guy on ebay with a 20vt running very rich and failing on emissions and literally every sensor, pipe and fuel component had been changed with no improvement, swapped out ECU and it then ran fine... an extremely rare problem.

Or what about the fuel pressure regulator or coolant temp sensor?

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#1621584 - 08/06/2018 19:14 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31719
Loc: Hemel in the Hempstead
For the brass screw setting:

- get engine to running temp
- remove idle control connector
- tweak screw to give around 700rpm
- reconnect idle controller

revs should rise to around 850rpm. If they don't go up, then the ICV is open circuit or stuck closed. If they rise lots, then the ICV is stuck open, or a possible fault in the throttle position valve.
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Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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#1621587 - 08/06/2018 21:31 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
BBR Online   sleepy
Club member 1435 - Membership
My life on the forum

Registered: 15/05/2011
Posts: 1531
Loc: Hemel of the Hempstead
Thanks GrahamL, I can’t clear the codes with startrek on the 16vna. I will double check rest and replace sensors you suggest and double check those already done again.

Cheers for th3 walk through Neil, being lazy where is the icv?
_________________________
16v NA Blitz Blue

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#1621591 - 08/06/2018 22:17 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3444
Loc: Pothole City
On the 20v I think it clears any stored codes if you disconnect the battery for a minute so that's worth a try.

One way or another, I'd definitely get the codes cleared before doing any further diagnosis.

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#1621618 - 09/06/2018 12:20 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
BBR Online   sleepy
Club member 1435 - Membership
My life on the forum

Registered: 15/05/2011
Posts: 1531
Loc: Hemel of the Hempstead
Ok so removed icv having found a pic of it online.
Cleaned it and put back together again.
Injector light still on.

Car ran better, no lumpy, no bunny hops, no revs dipping at junctions and pulling away.

Tried steps Neil gave re idle speeds
Disconnecting and/or reconnecting icv makes no change to idle speed.
Used brass screw to set to around 800 warm.

Will try and connect startrek console version when laptop charged to see what codes present now. Especially as disconnected battery for a fiat few minutes.


Edited by BBR (09/06/2018 16:33)
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16v NA Blitz Blue

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#1621627 - 09/06/2018 15:30 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
G_Man Offline
Club member 1656
Enjoying the ride

Registered: 16/03/2006
Posts: 707
Loc: Warrington
Fingers crossed for you - must be a real source of frustration frown Hope I don't hit anything similar with mine in due course! Keep us posted.


Edited by G_Man (09/06/2018 15:31)

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#1621642 - 09/06/2018 20:16 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31719
Loc: Hemel in the Hempstead
If it's any consolation, I've been trying to sort a hunting idle on my 16 for, ooh, ten years?
_________________________

Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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#1621912 - 16/06/2018 13:58 Re: Another weekend of 16v injector light misery ahead [Re: BBR]
G_Man Offline
Club member 1656
Enjoying the ride

Registered: 16/03/2006
Posts: 707
Loc: Warrington
BBR - any update on the injector light and did you finally get passed the MOT omissions problem .. confused

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