| [ Total Views: 588 | Total Replies: 8 | Thread Id: 40636 ] |
|
|
 phantom
Wolfsburg Wizard
Posts: 598
Threads: 196
Registered: March 28th, 2004
Member Is Offline
Location: Canberra ish
Theme: UltimaBB Pro Blue ( Default )
Mood: Where does this wire go?
|
| posted on June 16th, 2005 at 10:30 PM |
|
|
'Flat Spot' Guidance
One of my VWs (the one listed in this forum with the now-dead clutch pedal)...well, before I broke it, I just got it out from the mechanic. It had
its heads done, valves fixed, full tune and everything. It was running like a bag of proverbial before it went in and sounded so wonderful when it
came out.
Admittedly the last few bits were rushed as we needed to get the car out, so there was a last-minute timing check, etc before I took the car away.
I know I expected too much when I picked it up, I needed to realise that no matter how much had been done to it, it was still an old car. However, 2
questions that I need to place with the people here:
- acceleration flat spot - most noticable when changing into third and fourth...of course everything is new after the tune, head work, etc, but on a
1600 which is now supposedly running fairly good, should I still get flat spots? What can I do to remedy - is this just timing issue? My un-tuned
1500 actually has more power at gear changes than this re-done 1600
- when you start the car, etc it idles nicely....but if you pull up at lights, etc it dies from low revs. Again, could this be something simple?
Idle screw set too low, timing?
Any advice appreciated, I am looking forward to getting this thing running nicely and would hope to remedy these issues. Thanks!
|
|
|
 barls
A.k.a.: Mr indestructible
Super Administrator
Causer of Chaos and Mayhem
Posts: 9467
Threads: 295
Registered: June 22nd, 2004
Member Is Offline
Location: cruising in denistone east
Theme: UltimaBB Streamlined2
Mood: indestructible? and listening to the voices
|
| posted on June 16th, 2005 at 10:42 PM |
|
|
your running the 34 pict on the 1600 arent you there is a design fault in this carb that has a flat spot that is untunable
|
|
|
Anthiron
A.k.a.: Nicko McKay
Compulsive Aussie Vee Dubber
The Baja Rejuvenation Begins
Posts: 4936
Threads: 310
Registered: October 1st, 2003
Member Is Offline
Location: Buderim QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: Hell hath no fury like a womans scorn for sega.
|
| posted on June 16th, 2005 at 10:43 PM |
|
|
ok how about some specs on your engine first.
dissy?
carbie?
my guess is u have a 009 dissy with a 34 pict carb which creates a flat spot.
u can fix this by covering a little hole in the accellerator butterfly thingy (there was an instructions thing on here somewhere)
if not.
i found that when i bought my car i had a massive flat spot.
rebuilding the carbie. (30 pict2) and setting points and giving it a good tune got rid of all my problems. i have a 009.
also u are saying that it dies in low revs so. it could be a different problem which i recently experienced. i had some shit stuck in my idle air
passage in my carbie. try taking the carbie top off and unscrewing the idle jet. blow it out and empty the float bowl and blow some compressed air
down the passage it was screwed into. (works better if carbie off car) (make sure u empty the bowl if the carbie is still on the car of u will get a
face full of petrol.)
Nick
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
|
|
|
64vwmark
A.k.a.: Mark Shepherd
Fahrvergnugen
Posts: 930
Threads: 82
Registered: December 6th, 2004
Member Is Offline
Location: Perth
Theme: UltimaBB Pro Black
|
| posted on June 16th, 2005 at 11:31 PM |
|
|
Do you have a vacuum advance or mechanical dizzy? If you have vacuum advance, you could have an issue with the vacuum hose.
What is your point gap like? Did you measure it or just do it visually?
Beach Buggy
74 L Beetle
Mk4 Golf |
|
|
1303Steve
A.k.a.: Steve Carter
Scirocco Rare
Posts: 8636
Threads: 559
Registered: August 27th, 2002
Member Is Offline
Location: Sydney, NSW
Theme: UltimaBB Pro Blue ( Default )
Mood: Parrot Heading
|
| posted on June 17th, 2005 at 12:18 AM |
|
|
Hi
The biggest culprit with flatspots is the preheater on the manifold getting blocked up.
Steve
|
|
|
phantom
Wolfsburg Wizard
Posts: 598
Threads: 196
Registered: March 28th, 2004
Member Is Offline
Location: Canberra ish
Theme: UltimaBB Pro Blue ( Default )
Mood: Where does this wire go?
|
| posted on June 17th, 2005 at 07:42 AM |
|
|
Yikes! I knew all the technical questions would come up.
I have owned the car for only about three months and concentrated up till now on all of the other things that needed doing. It went to my VW mechanic
when we found we had valve problems, he did the tune etc as well.
As for setting point gap, I have not yet delved into that area but want to soon.
On types of dizzy's, carbies.....I can't say. I will say that one person told me I can't do anything while I have an aftermarket air cleaner on
the top - seems to be a simple round open silver doobrie...looks stylish but don't think it does much.
Anyway it appears that my problem is more than just a 5 minute job, I think I will concentrate on getting the thing rego'd and get some k's
happening on it, from there I'll look at these finer points.
If I revisit this post later, how can I recognise what dizzy and carby I have? Should I post pics, or find the model data on them?
|
|
|
Menangler
A.k.a.: Dave Becker
Custom Title Time!
Posts: 1991
Threads: 309
Registered: August 26th, 2002
Member Is Offline
Location: South Coast NSW
Theme: UltimaBB Pro Blue ( Default )
|
| posted on June 17th, 2005 at 09:20 AM |
|
|
I think you just answered your own problem,
"small aftermarket air cleaner"
This will cause a flat spot, especially if the carb has not been jetted to suit it, and it would be worse in the Canberra cold mornings.
Best to put the stock air cleaned with the warm air pre heat stuff hooked up, and check the pre heat pipe on the manifold.
FAHRVERGNUGEN;
Description of a pleasurable sensation,
Experienced when a car and it's driver are in mutual harmony, A unique driving experience, Pleasure, Satisfaction,
A feeling experienced by Volkswagen Drivers.
 |
|
|
VWCOOL
23 Windows of Awesome
Posts: 5158
Threads: 235
Registered: June 19th, 2003
Member Is Offline
Location: In the shed... Lake Macquarie NSW
Theme: UltimaBB Pro Blue ( Default )
Mood: happy to help
|
| posted on June 17th, 2005 at 09:37 AM |
|
|
yep... Canberra is cold. Must have the intake manifold warmer hooked up.
I found the acelerator pump on my 34PICT carby wasn't working until the throttle had opened a little way - in other words, there was no accelerator
enrichment when the throttle opened. MASSIVE flat spot... playing with the accel pump adjustment fixed it... mostly... but that doesn't explain your
idle problems
Pay your debts, CxxT
|
|
|
