Bookmarks

Yahoo Gmail Google Facebook Delicious Twitter Reddit Stumpleupon Myspace Digg

Search queries

temporary fix for crankshaft position sensor, sprocket xt 600, rear brakes at 4mm, how to bypass crank position sensor honda, dr 350 cdi, 1992 dodge spirit fuel system, how long will 4mm brake pads last, vg30e fuel pressure regulator, 99 suburban running rich, ga16 valve clearance

Links

XODOX
Impressum

#1: '81 Scirocco craps < 2800 rpm

Posted on 2006-07-20 23:15:05 by nutso fasst

Hello.

This happened suddenly, stopped briefly, then started again:

Engine starts but idles (barely) extremely rough. Give it a little throttle
and it runs terribly rough, with backfires, until rpms are coaxed above 2800
or so, then it runs smooth.

Ambient temp is 100F and humid, but engine is cold. Yesterday, when the
problem started (and briefly stopped, then resumed), engine was at operating
temp.

Any ideas?

Thanks,
nf

Report this message

#2: Re: '81 Scirocco craps < 2800 rpm

Posted on 2006-07-21 17:39:10 by SFC

Skipped timing belt? Check timing of the ignition.

SFC

&quot;nutso fasst&quot; &lt;<a href="mailto:no.replies&#64;no.where" target="_blank">no.replies&#64;no.where</a>&gt; schreef in bericht
news:tnSvg.10612$<a href="mailto:2v.3893&#64;newssvr25.news.prodigy.net..." target="_blank">2v.3893&#64;newssvr25.news.prodigy.net...</a>
&gt; Hello.
&gt;
&gt; This happened suddenly, stopped briefly, then started again:
&gt;
&gt; Engine starts but idles (barely) extremely rough. Give it a little
&gt; throttle
&gt; and it runs terribly rough, with backfires, until rpms are coaxed above
&gt; 2800
&gt; or so, then it runs smooth.
&gt;
&gt; Ambient temp is 100F and humid, but engine is cold. Yesterday, when the
&gt; problem started (and briefly stopped, then resumed), engine was at
&gt; operating
&gt; temp.
&gt;
&gt; Any ideas?
&gt;
&gt; Thanks,
&gt; nf
&gt;
&gt;

Report this message

#3: Re: '81 Scirocco craps < 2800 rpm

Posted on 2006-07-21 18:54:19 by nutso fasst

&quot;SFC&quot; &lt;<a href="mailto:SF-CILLARI&#64;HETNET.NL" target="_blank">SF-CILLARI&#64;HETNET.NL</a>&gt; wrote in message
news:44c0f520$0$2013$<a href="mailto:ba620dc5&#64;text.nova.planet.nl..." target="_blank">ba620dc5&#64;text.nova.planet.nl...</a>
&gt; Skipped timing belt? Check timing of the ignition.

Thanks for the suggestion. I will check, but given the way it briefly ran
OK, then went bad again, this seems unlikely. I was wondering if some
failing EFI component could cause this. On the other hand, there is some
noise from the timing belt area, so maybe the tensioner pulley bearing is
going bad.

nf

Report this message

#4: Re: '81 Scirocco craps < 2800 rpm

Posted on 2006-07-21 22:38:37 by Andrew Sullivan

On Fri, 21 Jul 2006 16:54:19 GMT, in rec.autos.makers.vw.watercooled
(message &lt;%E7wg.70784$<a href="mailto:Lm5.50967&#64;newssvr12.news.prodigy.com" target="_blank">Lm5.50967&#64;newssvr12.news.prodigy.com</a>&gt;), nutso fasst
&lt;<a href="mailto:no.replies&#64;no.where" target="_blank">no.replies&#64;no.where</a>&gt; wrote:

&gt; Thanks for the suggestion. I will check, but given the way it briefly ran
&gt; OK, then went bad again, this seems unlikely. I was wondering if some
&gt; failing EFI component could cause this. On the other hand, there is some

81s weren't EFI. Or not really EFI, anyway. There are some electric
bits, of course, but it's got a lot of mechanical bits.

I'd check the timing for sure. I never had the tensioner bearing
failure actually cause a jumped belt, but it's easy enough to check TDC
punch marks everywhere.

But before you go mucking about too much, look for broken or loose
vacuum hoses on the timing advance. I had this happen to me. Those
plastic hoses get old and crack. If the timing advance fails, you can
usually get the car to start, but it barely runs as you increase engine
speed. It's easy enough to look, but the broken hoses are next to
impossible to see if you're not looking for them. Since the hoses are
so brittle when old, they're easy to break, too, while changing oil or
whatever, so you have the sudden onset of strange timing-based problems
without any reason.

Andrew &quot;old and brittle like me&quot; Sullivan
Tranna

Report this message

#5: Re: '81 Scirocco craps < 2800 rpm

Posted on 2006-07-22 01:29:32 by Mad Maxine

You might also check the two big rubber boots on the air/fuel mixture
setup for cracks. I had a nasty crack on one of those on my Rabbit.
After I put on a &quot;new&quot; one, the car ran much better. Also, make sure to
tighten up the strap clamps on those. If they're loose, the boots can
blow right off when you start the car.

Maxine

Andrew Sullivan wrote:
&gt; On Fri, 21 Jul 2006 16:54:19 GMT, in rec.autos.makers.vw.watercooled
&gt; (message &lt;%E7wg.70784$<a href="mailto:Lm5.50967&#64;newssvr12.news.prodigy.com" target="_blank">Lm5.50967&#64;newssvr12.news.prodigy.com</a>&gt;), nutso fasst
&gt; &lt;<a href="mailto:no.replies&#64;no.where" target="_blank">no.replies&#64;no.where</a>&gt; wrote:
&gt;
&gt; &gt; Thanks for the suggestion. I will check, but given the way it briefly ran
&gt; &gt; OK, then went bad again, this seems unlikely. I was wondering if some
&gt; &gt; failing EFI component could cause this. On the other hand, there is some
&gt;
&gt; 81s weren't EFI. Or not really EFI, anyway. There are some electric
&gt; bits, of course, but it's got a lot of mechanical bits.
&gt;
&gt; I'd check the timing for sure. I never had the tensioner bearing
&gt; failure actually cause a jumped belt, but it's easy enough to check TDC
&gt; punch marks everywhere.
&gt;
&gt; But before you go mucking about too much, look for broken or loose
&gt; vacuum hoses on the timing advance. I had this happen to me. Those
&gt; plastic hoses get old and crack. If the timing advance fails, you can
&gt; usually get the car to start, but it barely runs as you increase engine
&gt; speed. It's easy enough to look, but the broken hoses are next to
&gt; impossible to see if you're not looking for them. Since the hoses are
&gt; so brittle when old, they're easy to break, too, while changing oil or
&gt; whatever, so you have the sudden onset of strange timing-based problems
&gt; without any reason.
&gt;
&gt; Andrew &quot;old and brittle like me&quot; Sullivan
&gt; Tranna

Report this message