[scimitargtc]

Sure this is a really stupid Q - 97 4.0 petrol - Gunsons Gas tester professional (DIY kit in UK) reading 4.5% and the car has started to smell of fuel with increasing consumption - just how do I plug WHAT into WHERE to READ and ADJUST ~~~~~~~~~~ my Reliant Scimitar has a mechanical fuel pump and carburettor so a twist here and a screw there & I'm sorted....

 

[Rich998a]

If it's starting to smell rich, chances are one of the HO2 sensors are playing about. Can you read any codes via the OBDII port? Any chance of connecting it to T4?

 

[Rich998a]

An OBDII reader should give you a Powertrain Pxxxx code or DTC - See viewtopic.php?f=8&t=29550 - so you need to plug in a 16 pin OBD reader into the plug down in the bottom right of the passenger foot well (UK RHD). Chances are it is pointing towards an engine sensor failing, probably the HO2 sensors in the cat end of the exhaust.

You'll need to reset the system using Testbook (or similar) or you can disconnect the battery for a while and then take it out for a long drive.

 

[Ka177ran]

you can disconnect the battery for a while and then take it out for a long drive.

Pardon my ignorance, but I thought that only worked on the later P38's and not the earlier ones (OP has a 97)? :think:

 

[p38arover]

you can disconnect the battery for a while and then take it out for a long drive.

I find mine won't start if the battery is disconnected. :dance:

 

[p38arover]

If it's starting to smell rich, chances are one of the HO2 sensors are playing about. Can you read any codes via the OBDII port?

Yours has WATER sensors? Quick, connect them to the coolant reservoir!

 

[Rich998a]

Stop taking the piss, you two. :naughty:

I find my 95MY will revert to base settings when the battery is disconnected for a while. Not sure if it is true, but it definately runs rough for a few miles after.

And Ron, Land Rover refer to the oxygen sensors as HO2 sensors. I'm trying to be consistent in following the terminology.

 

[shupack]

I think it stands for HEATED 02 sensor..

 

[scimitargtc]

Sealey scanner shows no fault codes - I'd just assumed the metering has drifted off as it does on the Scim ~ being a tight wad (UK = miser) rather than dump it on my local Guy thought I'd learn how to adjust electronically,,,,,,,, I'll happily drop out the batt for a day or 2 if this resets it just seems weird that there is a 'set' value and no means to adjust (each car is an individual so would have thought tweaking would be in order)...

 

[Rich998a]

If a HO2 sensor is on it's way out, reseting the ECM is only going to put you back to square one again. I'd get it put onto Testbook to check what is going on. It would be worth the diagnostic plug in cost as you'd be saving time going straight to the fault.

 

[Ka177ran]

Stop taking the piss, you two. :naughty:

[youtube:5a7m8ndj]http://www.youtube.com/watch?v=YPIsTKpAoE4[/youtube:5a7m8ndj]

I read it was possible on the later ones and presumed it was the same for our rigs and said so to that effect - I was politely corrected by AllyV8 (IIRC).

I find my 95MY will revert to base settings when the battery is disconnected for a while. Not sure if it is true, but it definitely runs rough for a few miles after.

Maybe the battery disconnect clears the short term trims giving you a few rough miles but the long term trims definitely need an adaptive values reset.

This was a subject I read up on, when I was doing a little R&D into closed loop single point lpg systems.