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High MPG, odd idle issues, and a thank you. 85 1.9
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The Raven
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PostPosted: Sun Oct 16, 2011 10:13 am    Post subject: High MPG, odd idle issues, and a thank you. 85 1.9 Reply with quote

First off thank you for everyone who helped me here:
http://www.thesamba.com/vw/forum/viewtopic.php?t=484212

Turned out that a cleaning of the grounds and an additional ground on the alt helped charge the battery well.

Now for my next question;
I filled up today, 10 gallons. My odo indicated 127mi, corrected via known landmarks my real miles were about 145. So my van is getting about 14mpg.

This seems VERY low. Were do I start in addressing this oddly low MPG? I believe the O2 is new.

A few symptoms that may be related;
-High idle after an extended run
-Misses occasionally at idle after an extended run.
-Slightly difficult to start as in it takes a few revolutions.
-The engine occasionally on warm up when idling at 1200rpm will cut out, catch, cut out catch
-All of the above stop when shut off and restarted.

Thoughts? Question
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r39o
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PostPosted: Sun Oct 16, 2011 11:17 am    Post subject: Reply with quote

Your mileage is off. BUT, not totally out of the ballpark.

Via the FAQ: http://www.thesamba.com/vw/forum/viewtopic.php?t=136963

Based on your symptoms you could have several things:

Intake leak

Bad or slow O2 sensor. Cheap one via the FAQ: http://www.thesamba.com/vw/forum/viewtopic.php?p=1796710

Wrong / old / misgapped spark plugs

In other words you need to go over your tune up basics

Usually we start with a new Sensor II and O2 sensor to get the process started

Then add to that tire pressure.

Plus your speed / driving habits have a lot to do with it too.

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bjrogers86auto
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PostPosted: Sun Oct 16, 2011 11:25 am    Post subject: mpg Reply with quote

I think if you check Ben's site...benplace.com...he has an article on 1.9 idle and timing. I think the basic idea is that as the grounds get bad people adjust the timing to improve idle and mess with the idle screw. Once your grounds are functioning properly you need to put things back to normal.

My brother-in-law had a similar issue with his. This was the problem.

Brian.
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The Raven
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PostPosted: Sun Oct 16, 2011 1:52 pm    Post subject: Reply with quote

Ok,
This week I'll address and clean up all the grounds I can find. Although the guy I bought it from was an old school VW tech through and through I feel as though he had a habit of just letting things slide due to things I have found (power steering bolts, O2 Grommet, etc etc.) As this was his van I think he just got used to seeing minor things wrong and never investigated fully. He did rebuild the engine last winter, and it runs while going great, passing in performance my 97 jeep and making me wonder why people complain about these things power. It is however plagued by these little things and they just need to be sorted out I guess. This thing has so many vac hoses, many with a putty on them to prevent leaks (guessing there must have been a leak somewhere). I would love to get a set of new vac lines and just put the engine back to stock and start fresh. In any case, step by step.

Plan of action:
-Pull out the bentleys and pin out the sensors, clean up ALL grounds and access the running conditions after that.
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heidi85ho
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PostPosted: Mon Oct 17, 2011 6:42 am    Post subject: Reply with quote

If you can see "patches" on your vac lines, that would be the first things to replace. Vac lines are cheap.
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MarkWard
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PostPosted: Mon Oct 17, 2011 8:01 am    Post subject: Reply with quote

Quote:
passing in performance my 97 jeep


Leaning on the engine will use more fuel. Try using a lighter foot and the things mentioned above.
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The Raven
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PostPosted: Mon Oct 17, 2011 11:53 am    Post subject: Reply with quote

OK,
Today I went out and put new terminals on all the grounds that had even the closest doubt in my mind of being compromised. I cleaned up the O2 connector as it was a bit oxidized. I also tested sensor 2 and it's fine.

The problem did not go away. So....

-I disconnected the green idle box and plugged the connectors together and the idle dropped to 800 and kept dipping lower to an almost stall before recovering.

-I then tested the idle control to see if I got continuity per bentley and nada, nothing, not continuity/click or otherwise. I'm guessing this may be a big issue? I will do a search..but what are the symptoms of bad idle switch?
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The Raven
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PostPosted: Mon Oct 17, 2011 1:45 pm    Post subject: Reply with quote

Well, went ahead and removed the switch....it's bad. Now where do I get one. I can't seem to find any for sale???
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Timwhy
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PostPosted: Mon Oct 17, 2011 2:47 pm    Post subject: Reply with quote

The Raven wrote:
Well, went ahead and removed the switch....it's bad. Now where do I get one. I can't seem to find any for sale???


http://www.benplace.com/parts_sale1.htm

Bens site has them and he is close bye
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The Raven
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PostPosted: Mon Oct 17, 2011 3:06 pm    Post subject: Reply with quote

I emailed him and I'm awaiting a response. In the meantime via search I found a place where someone opened up a switch to fix it. So I did. Fairly simple switch. Ended up melting a little bit here, bending a little bit there and seems to be working for now. The eccentric cam was broken as well so I just ordered one of those.

Hopefully once all is said and done, more will be done than said.

I figure I'll put the repaired switch back in, and keep a spare known working one if I can buy one from Ben. Hopefully this will solve these issues.
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The Raven
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PostPosted: Sat Oct 22, 2011 5:34 am    Post subject: Reply with quote

I just put it all together last night. New eccentric cam where the old one was snapped off. Repaired switch in, set I think right but I do not have a feeler gauge that small so guessed the setting. I started it up, idled at 1000-1100. Did not start looping as before. Took it for a drive and once fully warm settled down to 800-900rpm.

Do have another couple questions:

On start up when sitting for a while, the starter does not turn. I have to engage the key, wait a few seconds and then it goes, No click, nada. Is this an ignition switch issue or a starter issue?

When I give it full throttle now, I notice a faint dimming of my dash lights. Natural?
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Timwhy
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PostPosted: Sat Oct 22, 2011 6:15 am    Post subject: Reply with quote

When I lost my starter due to its old age, I also changed out the ignition switch. For a $5.00
part to be so vital, it only make sence to get a new one.

The new switch has noticable positions that the old one probably once had. I also added
a hard start relay http://www.thesamba.com/vw/classifieds/detail.php?id=1119534
The relay takes out power to the switch and keeps it close to the starter.
Same idea as the headlight relay, so to speak.

Jay sells some really good kits that are ready to bolt on.
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