[x300] Non Premium gas=check engine light?

I own an 86 xj6 and always used non premium. I just bought a 97 xj6
vanden plas and the first time I put gas in it the check engine
light came on after a couple of miles. Did the non premium(89
octane) bring it in and if so will it clear if I fill up with high
octane premium. Because I wasn’t sure I only put 20.00 dollars
worth in a near empty tank. I know it has an anti knock sensor to
retard the timing, I’m just not sure if the lousy gas could bring
in the check engine light. Thanks for any info in advance.
Ray–
86 jag
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In reply to a message from 86 jag sent Tue 11 Sep 2012:

Ray, a couple of questions come to mind. Did you put in mid grade
or low grade unleaded? Did the engine ping or knock when you drove
it? Did you buy the car from a dealer or private seller? Could the
battery have been dis connected or could the check engine light
have been re set? A ‘‘cleared’’ check engine light will reappear
after a set number of miles if a problem was hidden at sale time.
Brandon–
Brandon St James X308 2002 VDP 4.0L
VENTURA CALIFORNIA, United States
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In reply to a message from 86 jag sent Tue 11 Sep 2012:

Make sure the gas cap is on tight.–
The original message included these comments:

I own an 86 xj6 and always used non premium. I just bought a 97 xj6
vanden plas and the first time I put gas in it the check engine
light came on after a couple of miles. Did the non premium(89


@mgb4tim
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In reply to a message from 86 jag sent Tue 11 Sep 2012:

You have some strange grades of gas in your country…and I’m
assuming you have put some cheap and nasty fuel in your car which
may have triggered a warning.
The X300 will not tolerate cheap gas like your previous XJ6 and you
run the risk of fouling the O2 semsors.
Fill the tank wioth premium fuel and take it for a blast.
You will find that you will probably get a few warnings until the
enginme has completed a few start cycles.
Once the system has cleared itself with decent fuel, things should
settle down.
I would be inclined to use a fuel system cleaner and also check the
plugs and their gaps.

Cheers,
Maximus–
The original message included these comments:

I own an 86 xj6 and always used non premium. I just bought a 97 xj6
vanden plas and the first time I put gas in it the check engine
light came on after a couple of miles. Did the non premium(89
octane) bring it in and if so will it clear if I fill up with high
octane premium. Because I wasn’t sure I only put 20.00 dollars
worth in a near empty tank. I know it has an anti knock sensor to
retard the timing, I’m just not sure if the lousy gas could bring
in the check engine light. Thanks for any info in advance.
Ray
86 jag


Max Heazlewood '98XJ8http://www.pbase.com/padme002/jj_jag_1
Tasmania, Australia
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In reply to a message from mgb4tim sent Wed 12 Sep 2012:

I put in midgrade(89 octane). It was a private sale. There were no
codes in when I bought the car. It came in just a couple of miles
after I put the midgrade in.
Thanks–
86 jag
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In reply to a message from 86 jag sent Tue 11 Sep 2012:

I use the lower octane fuels all the time with no problems.
You could get cruddy fuel that’s contaminated with water,
trash, etc., but that’s based more on your seller and his
tanks than the octane rating.

These newer cars with all the computers and sensors and such
should be able to compensate just fine to a lower octane
fuel. If the computer notices anything, it should adjust
the timing advance, etc. long before you notice anything.
But it shouldn’t set a fault code. You may be a slightly
degraded performance or slightly different gas mileage, but
I’ll leave it to others to argue about whether it would be
noticeable.

Have you checked to see what the code is? That’s the first
step. If you don’t have a scanner of your own, usually a
parts store like AutoZone, Pep Boys, etc. will have one
they’ll let you use for free. Most of the time, they’ll
even come out and check it for you. If you haven’t driven
too much since you bought the car, it may also be able to
tell you if the check engine light has been reset recently.

Good luck.–
'95 XJ6 4.0, '96 VDP 4.0 & XJS, & '96 XJR w/ 45k!
Dallas, Texas, United States
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In reply to a message from 86 jag sent Tue 11 Sep 2012:

I got my scan tool from my son and hooked it up. It spit out two
codes(P0400) and (P0403) both of which are EGR codes. They both
cleared and I put some 93 octane in and it hasn’t brought light
back on…yet.

Thanks all for the replies.

Ray–
86 jag
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In reply to a message from 86 jag sent Wed 12 Sep 2012:

Ray, have a look at the following thread from the Archives,
if you haven’t already done so I’d clean the ERG valve as
these are notoriously sensitive to a dirt/clogged up valve.
Surprised none off our US cousins haven’t suggested this as
it’s a common issue that they are normally pretty anal about.

http://forums.jag-lovers.org/av.php?1508483n66--
The original message included these comments:

I got my scan tool from my son and hooked it up. It spit out two
codes(P0400) and (P0403) both of which are EGR codes. They both
cleared and I put some 93 octane in and it hasn’t brought light
back on…yet.


Neil 70 '97 3.2S http://www.jag-lovers.org/v.htm?1242166704
MALDON, United Kingdom
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