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Post by Shane on Jan 2, 2018 17:29:48 GMT
Hi Everyone,
Hope you all had a great xmas and new year, its been a while!
Today the car failed its IVA. Not a big deal, nothing a little edging, a few washers and cable ties wont fix (sort of)
Any way, the main thing that make me want to take a baseball bat to the car is that it failed the emissions!
And when I say failed, I mean off the charts:
Co - 11.01
HC - 491
LAMBDA - 0.849 (below minimum)
I have always thought the car smells rich and it does take a few seconds longer than it should to fire up each time, especially after a good run also I forgot to mention that while they were testing the spedo at 70mph the car over heated (expansion tank overflowed!) even though it has new rad, new rad cap, new thermostat etc, so this also is making me think it is running very rich and therefore hot!
First I thought dodgy O2 sensor, but thats to simple as the readings are way off on all 3 tests.
I have read that a faulty temp sensor can also fool the car into running rich and as you may be aware, I have had nothing but electrical problems surroundings the temp sensor/guage etc
What to do?
Cheers all
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Post by sheffjohn on Jan 2, 2018 18:49:38 GMT
Run a separate wire from the temp sensor, to where it should go (ecu I assume, maybe via clocks). Eliminate dodgy wiring that way.
Temp sensors won't be dear, worth a try. Early 90s Volkswagen's were very similar, blue temp sensor failed and they ran super rich all the time.
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Post by mikeeyboy on Jan 2, 2018 19:29:51 GMT
My car was running rich originally but this was before I had sorted the charcoal canister out.
Did you remove the system? If so there is a sensor that has 2 pipes that connects to it. Just loop these 2 so the sensor doesn't read anything daft. One of the pipes that connected to here came from the inlet, seal this with an M5 bolt or such like screwed up into the pipe.
I've booked my test this week and I'm still not 100% confident on the emissions side.
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Post by Shane on Jan 2, 2018 19:46:46 GMT
Run a separate wire from the temp sensor, to where it should go (ecu I assume, maybe via clocks). Eliminate dodgy wiring that way. Temp sensors won't be dear, worth a try. Early 90s Volkswagen's were very similar, blue temp sensor failed and they ran super rich all the time. Just had a look at the wiring diagram and the temp sensor it seems out of the 3 wires one goes to the O2 sensor and the other to the ECU so thats very interesting, worth splicing the wires I think and try that as I have already replaced it 3 times trying to figure out the issues in the past! |
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Post by Shane on Jan 2, 2018 19:48:50 GMT
My car was running rich originally but this was before I had sorted the charcoal canister out. Did you remove the system? If so there is a sensor that has 2 pipes that connects to it. Just loop these 2 so the sensor doesn't read anything daft. One of the pipes that connected to here came from the inlet, seal this with an M5 bolt or such like screwed up into the pipe. I've booked my test this week and I'm still not 100% confident on the emissions side. I have completely removed the charcoal canister mate. Is it possible to show me a pic of the sensor you mention needs looping and the sealing off at the inelt? Cheers Mate |
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Post by mikeeyboy on Jan 2, 2018 20:19:57 GMT
Is yours a mark 1 or 2, I'll get photos shortly.
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Post by Shane on Jan 2, 2018 20:27:46 GMT
Is yours a mark 1 or 2, I'll get photos shortly. 1998 MK2 1.8 matey |
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Post by mikeeyboy on Jan 2, 2018 20:58:39 GMT
Here's where I looped the pipe, originally the pipe from the inlet connected onto one side.  Then the pipe that now comes out of the manifold has a bolt into seal it off. If you look at the wiring diagram that solenoid is cabled straight to the ECU,  |
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Post by sheffjohn on Jan 2, 2018 21:54:36 GMT
Also; running rich shouldn't mean running hot. Exactly the opposite, lean is hot. Excess fuel cools the combustion side of things.
Definitely not an airlock or anything in cooling system that wasn't exposed/bled before that time on iva ?
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Post by Shane on Jan 2, 2018 21:57:35 GMT
Also; running rich shouldn't mean running hot. Exactly the opposite, lean is hot. Excess fuel cools the combustion side of things. Definitely not an airlock or anything in cooling system that wasn't exposed/bled before that time on iva ? Interesting, had the car running for hours but it was the first time it was put under load up to 70mph, did everything i possibly could before test to bleed the system before hand, still spewed everywhere |
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Post by Shane on Jan 2, 2018 21:59:57 GMT
Here's where I looped the pipe, originally the pipe from the inlet connected onto one side. Then the pipe that now comes out of the manifold has a bolt into seal it off. If you look at the wiring diagram that solenoid is cabled straight to the ECU, Awesome thanks mate, I dont actually have that part anymore as it was removed when i removed the canister  |
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Post by sheffjohn on Jan 2, 2018 22:04:11 GMT
Also; running rich shouldn't mean running hot. Exactly the opposite, lean is hot. Excess fuel cools the combustion side of things. Definitely not an airlock or anything in cooling system that wasn't exposed/bled before that time on iva ? Interesting, had the car running for hours but it was the first time it was put under load up to 70mph, did everything i possibly could before test to bleed the system before hand, still spewed everywhere Had it running since test ? What temp gauge are you using ? Standard temp gauge on some years I believe is notoriously bad, and reading a little over halfway is already way hotter than it wants to be. |
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Post by Shane on Jan 2, 2018 22:11:51 GMT
You are right the temp guage is useless, but very basic as only uses the ground the move the needle, there is no signal wires so cant see how the gauge would effect anything, i could disconnect the gauge and the car would still run and should run fine.
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Post by sheffjohn on Jan 2, 2018 22:15:57 GMT
You are right the temp guage is useless, but very basic as only uses the ground the move the needle, there is no signal wires so cant see how the gauge would effect anything, i could disconnect the gauge and the car would still run and should run fine. Yep understood, just didn't know if you knew what temperature it was actually running at thus should you be v. worried or not |
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Post by Shane on Jan 2, 2018 22:17:59 GMT
You are right the temp guage is useless, but very basic as only uses the ground the move the needle, there is no signal wires so cant see how the gauge would effect anything, i could disconnect the gauge and the car would still run and should run fine. Yep understood, just didn't know if you knew what temperature it was actually running at thus should you be v. worried or not Definitely overheated as it filled the overflow tank with boiling water then pissed all over the IVA mans floor  |
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