Hello all. Hopefully someone can help me out.
Whenever I start my car (whether it's been off for 5 minutes or
overnight) the car can't be revved too fast (ie. flooring it). Revving
it too fast causes it to stall. I have found that slowly revving it up
to 3000 RPMs and holding it for about a minute fixes the problem. If I
don;t do this it just stalls when I try to drive it.
Any ideas as to what the problem might be??
in article firstname.lastname@example.org, Ed at
email@example.com wrote on 29/12/2005 16:47:
Sounds to me like a fuelling issue.
The fix? Change the air filter, change the fuel filter and have the mixture
checked. Total cost should only be a few pounds/dollars. Ensure that the
idle throttle speed is adjusted to 950 RPM prior to adjusting the mixture
and that it is at 950 RPM correctly adjusted. Any garage should be able to
do this competently within the hour.
Following that, ensure that your ignition is good. A clean spark does
wonders for a good running engine :) New plugs - use NGKs. BP7ES for i16,
BP6ES for i8, BCP7EV(x) for T16 and BP7EV (or BCP7EV for higher performing
engines) for T8. Perhaps some new HT leads? You can use Bosch if you can't
afford Bougicord. Dizzy cap and rotor arm can also be changed for the price
of a packet of cigs. Essentially, cheap stuff, but try the air and fuel
filters first with a mixture check.
Finally, a timing check? I bet the problem is resolved by that point though.
Good luck Ed,
1989 900 Turbo S
I took your advice and checked the air filter and it was fine. But
while doing that I noticed the problem. There is too much air being
sucked in which is preventing the combustion. I put my hand over the
air intake to allow less air in and lo and behold it was revving
perfectly. So now my question is, how do I fix this without bringing
it in to the shop (if possible, of course)?
in article firstname.lastname@example.org, Ed at
email@example.com wrote on 31/12/2005 18:42:
It did sound like fuel starvation. What does it idle at?
Either your throttle needs to be dropped down slightly, or the cold start
system is not closing off air when the engine is warmed.
To adjust the throttle find the 8mm nut and grub screw that stops the
throttle and adjust to suit. If you idle at, say, 1100-1200 RPM at warm,
then the automatic air control valve (and auto-choke device) is not closing
off properly. Either way, adjusting the idle will alter the mixture. You'll
still need to have the mixture checked, else it will be too rich.
What model car is it, BTW? In the UK, we still had 8V cars in 1989. Is it a
turbo car? Throttle adjustment on a 16V may be different to the 8Vs I'm used
to, but there's expertise here.
1989 900 Turbo S
in article firstname.lastname@example.org, Ed at
email@example.com wrote on 31/12/2005 19:51:
Yes, the idle is right on, so I think your AAV/AIC valve is fine (that's the
auto-choke which allows more air into the combustion when cold by bypassing
the throttle). It does sound like poor fuelling, which could be as simple as
a lean mixture. On the 16V of your age, the mixture is electronically (or
electrically) controlled by means of a hot wire inside the box just behind
the air filter. There is a feedback from a lambda sensor in the exhaust,
too, but both would require some hands on testing.
I've no direct expertise in either, but if you're handy with a multimeter
I'm sure some of our 16V friends here will offer advice. Otherwise, any
garage that can deal with Bosch FI systems of that vintage (and they were
used on all manner of cars in the late 1980s/early 1990s) will sort the
issue, I'm sure. Good luck.
Happy New Year everyone,
1989 900 Turbo S
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