A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« on: July 15, 2008, 07:55:06 PM » |
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Right, where to start..
Me dad has recently bought a L Reg Cav 1.8ls auto.. 8 valve SFi
When the revs are held at about 1800-2000rpm it starts to over fuel like hell.. had it on an emissions meter and the HC went from about 200ppm to 3000ppm.. ( me gsi runs cleaner than that !)
there was 2 fault codes in the memory
13 & 15 i think.. basically the CTS & Lambda sens.. these have both been changed
Other new bits fitted/done
Oil & filter change
Air filter
Plugs
Dizzy & rotor
I know these are normally fairly simple to solve but this has got be baffeled !
Any ideas would be greatfully appreciated
thanks in advance !
Steve
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Neil
Newbie
Posts: 42
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« Reply #1 on: July 16, 2008, 12:41:38 PM » |
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Just checking you've changed the right temperature sensor, there is a small one for the dashboard and a larger one which is the one that feeds the ECU.
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SJC
Full Member
Posts: 218
Location: Alloa, Scotland
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« Reply #2 on: July 16, 2008, 01:18:01 PM » |
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The CTS for the ECU will have a 2-pin plug on it, whereas the temp gauge one will be a single spade connector.
If the CTS (or the wiring plug for it) is duff, the ECU will think the engine is stone cold and won't go into closed loop - if it did then the lambda would correct the mixture and your HCs would be ok once the engine is warm.
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #3 on: July 16, 2008, 04:33:07 PM » |
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yes definately changed the CTS Blue top twin connector ! tried 2 in it.. still overfueling..., when its disconnected the EM light comes on so the connector & wiring must be ok.. Any ideas  ?? |
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Pedro
I'M A FILTHY TORY!
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Posts: 6605
Location: York
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« Reply #4 on: July 16, 2008, 05:59:49 PM » |
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Sounds like the same problem I had with my Calibra - turned out that the CTS connectors were mucky, and I knocked it when changing the oil and water last summer. Cleaned the connector contacts carefully with fine wet 'n' dry paper, then a squirt of switch cleaner. Job's a goodun!  Hope that helps! |
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Do you know what "Nemesis" means? A righteous infliction of retribution manifested by an appropriate agent. Personified in this case by an 'orrible c*nt... me.
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #5 on: July 16, 2008, 09:38:14 PM » |
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thanks for that pedro, i'll give it a try tomorrow...
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #6 on: July 17, 2008, 04:44:14 PM » |
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cleaned out the CTS connector & it's still doing the same... could it be the throttle position sensor ?
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SJC
Full Member
Posts: 218
Location: Alloa, Scotland
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« Reply #7 on: July 18, 2008, 10:22:44 AM » |
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Would doubt it.
One last check on the CTS... pull back the rubber sleeve on the plug so you can see the back-end of the pins and put a voltmeter across them with the engine running. Can't remember off the top of my head what reading you should get... but when it's cold you should get something over 4 volts, and when it's warmed-up you should get a pretty low reading, probably under 1 volt.
This test will confirm that the cabling and sensor are operating correctly - the 5v supply comes from the ECU so the only way you'll get a reading is if the cabling is intact.
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« Last Edit: July 18, 2008, 12:31:55 PM by SJC »
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #8 on: July 18, 2008, 08:16:50 PM » |
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so if they are working correctly ( i haven't checked yet tho' ) does anyone have any other ideas on the cause ?
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #9 on: July 19, 2008, 09:09:10 PM » |
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I've checked the CTS resistance & supply voltage and both are correct & within the limits, I even checked the old CTS & found that to be working too..
Any Other ideas anyone?
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #10 on: July 24, 2008, 11:32:04 PM » |
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Just to let U all know, the cav is fixed...... would you believe it was the EGR valve !!! so it's been disconnected & the vacuum pipe plugged.. it's running a hell of alot better now !
thanks for the replies
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Pedro
I'M A FILTHY TORY!
Global Moderator
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Posts: 6605
Location: York
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« Reply #11 on: July 25, 2008, 08:09:37 AM » |
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Good to hear it's fixed mate - I wouldn't have known it had an EGR valve though. I didn't know the 8 valve would have had an EGR valve!
Have you blocked it off with a gasket made from a coke can? Apparently that's one way to do it, and leave everything alse connected (taken from VXON spomewhere).
For some reason, I thought only Ecotech XEV and V6 engines had EGR valves, and that they were fitted from 1995.
With yours being an L reg ('94), I guess it's "on the cusp" then?
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Do you know what "Nemesis" means? A righteous infliction of retribution manifested by an appropriate agent. Personified in this case by an 'orrible c*nt... me.
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #12 on: July 25, 2008, 09:58:23 PM » |
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yher it must have been !
the egr is still fitted just the vacuum pipe disconnected & plugged !
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