Engine Management Light

buzzard

Guest
This is a real saga this one...

The engine management light came on my Ibiza 20VT last year sometime - can't remember exactly when but it didn't seem to have any effect on the behaviour of the car. So I left it a little while as its service was coming due a few weeks down the line. The Seat dealer couldn't find anything wrong with it and reset the light. The light stayed off a while, until I was unable to get any Optimax for it, which it had been running on at every fill-up for two years. Then the light came back on within a few miles of sticking 95RON in it.

So, another journey back to Seat for a light reset. That lasted about 70 miles, and the brake vacuum hose was replaced on the recall from Seat. And the light was reset again. That lasted about another 70 miles - again.

Fed-up at this point, I took it back to Seat AGAIN and their most experienced technician did a full diagostic check on it. Two hours later, he showed me the reports. They looked like double Dutch to me, which was a real shame, because he didn't have an explanation for them either. So he sent me away with some things to log.

To cut a very long story short, there are no apparent problems with the car except for noticing fuel consumption and relative performance. As follows, after running it round on several consecutive tankfuls of each type of fuel:-
Optimax - average 34mpg (typical from new, regardless of fuel type), car goes like snot-off-a-stick
Super Unleaded (97RON Sainsbury's variety) - average 32mpg, car goes ok but lacks real sparkle and edge
95RON - average 29mpg, car runs like an asthmatic old pit pony

Back to Seat with the findings. They reported that the car is running lean but none of the sensors are reporting a problem - just a whole catalogue of errors that no-one seems to be able to make any sense of.

Over the winter, it's now started (on mornings where the external temperature is reported by the car as being 5C or less) beeping and flashes the red warning light on the temperature gauge for a minute. So I checked the handbook and the suggestions made in there for the cause of the error weren't present, so I'm at a loss with this one!

Any suggestions anyone please? Selling it isn't an option either, due to lack of cash and the fact that I do like the car! I thought about taking it to a specialist like VAGTech, the Seat dealer wanted to start swapping parts like the Lambda sensor at my expense and following that path until the problem was found. That's not going to happen! I want to go to someone who can say "This is what's wrong with it" and walk away with it fixed.

Cheers!
 

redgt

Full Member
Mar 4, 2006
118
0
95RON - average 29mpg, car runs like an asthmatic old pit pony



LMAO, im running my car on that, but only had it 2 days so never even tried optimax. hmmmm
 

buzzard

Guest
I used to see a yellow MG ZT160 regularly on my way to work a couple of years ago. That was pretty much a match for my Cupra when I ran it on 95RON and the guy was always trying to prove a point. So I switched to Optimax and it took about three tankfuls to really show a difference. But the difference was amazing - like a half a sliproad onto the motorway and the MG was history - up to 70mph of course. It happened a few times, so it wasn't a fluke. Be warned though, if my experience was anything to go by - one tankful of 95RON and it reverts back to its old ways in about 5 miles...:(
 

m0rk

sarcasm comes free
Staff member
May 19, 2001
27,787
33
Clanfield, UK
if they're saying it's running lean, then it's likely the MAF is failling.... but not failled.

if you're local to Northampton I don't mind doing some datalogging (you need to be moving to do this) and i'll bet the dealers didn't do what you 'need' to do
 

buzzard

Guest
Excuse my ignorance, but what is MAF?

M0RK - I live near Birmingham so Northampton isn't that far really.
 

m0rk

sarcasm comes free
Staff member
May 19, 2001
27,787
33
Clanfield, UK
MAF measures the air flow on from the airbox to the turbo. it's THE most common failure, and 90% of dealers won't swap it.

The offer is there if you want to do some logging... (involves 4th gear full throttle runs as far up the rev range as possible really)
 

buzzard

Guest
M0RK - thanks for the offer, I think I'd like to take you up on that. It's probably best if we continue this conversation offline in email?
 
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