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#76
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Re: Initial hesitation
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Your MAP could be fouling also (happened on my 1992 SVX at 160,000 miles) so Airbox needs to come off (so you can plug the MAP wires back in..on firewall) spray connectors vigorously (with MAF cleaner) in connector housing and plug in, reconnect plugs after 5 minutes - To make sure MAF cleaner has completely dried off , then the fun part of reconnecting that Air Box. Last edited by RisingPhoenix; 06-15-2018 at 08:56 PM. Reason: Add |
#77
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Re: Initial hesitation
my 92 did this for EVER. upon start, best to let it warm up or it would have a hesitant throttle response. Park it in a garage and it was not near as bad. It's been answered already. I would clean the MAF connections and MAF itself and apply some Stabliant 22a on the connections. Actually, use that on ALL electrical connections. The wave you speak of kinda clears once it warms up and always ran the AC. mine would drop a lot lower at idle than 2100. As you know the SVX idles rather low. 2100 would be high to me. It's just a cold natured car. takes it a minute to get its bearings. but clean everything throttle body, plate, Maf, check the 02's. and honestly I had my injectors cleaned and that made a difference as in like night and day difference. Power light would come on with just a light tap. but part of my service included fogging out the entire intake. 17 years and over 100k miles. that first start hesitation, if you went to just start and go, was always there. There can be other issues with grounds or funky signals and I think that's possibly part of it till things warm up so TREAT every connection with stabilant 22. It's your friend you can find it online or you can order it from any VW dealer. runs about 50$.
May you have many years and many miles of fun. I sure miss mine. SVX1999 Ryan |
#78
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Re: Initial hesitation
WOW!! I found the source to the rough idle/RPM oscillation during idle..only when my car is idling though. While SVX is running I unplugged the inlet on my charcoal canister and it sucks air into the manifold really well..is this normal??? Anyways, when I place my finger over the inlet hose opening..car idles PERFECTLY. Hmm. To further check my hypothesis the tiny hose (outlet hose, I think?) on the back of the intake I removed...car wants to die when it's off....BUT, when I place my finger over the steel connector....the car regains it's idle and runs smooth as glass.
What could this be?? A faulty EGR valve or something?? So the poor idle/oscillating RPMs are caused by vacuum that is not working right somewhere... Is my charcoal canister gone TITS UP?? Haha |
#79
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Re: Initial hesitation
If it's having trouble starting I'd change the fuel filter and see about having the injectors cleaned and intake fogged out. takes about 30 mins if they got the right setup. Then start looking at vacuum lines for leaks. Sensors and so forth. PCV. depending on age plugs can also be a small issue. Go back with what the SVX calls for which was NGK. only had to change mine once in all the years I had it. They are good for about 80k max but they will be worn slap out by then. If I'm recalling right I think book calls for those to be changed every 60k. which would be about accurate with what I saw. I know there are other plugs but honestly your not going to get a whole lot of bang for what you'll spend. so I just stick to what I know works. ( usually cheaper in the long run ) as we all know SVX loves your wallet and getting cozy with it. but it's worth it.
May you have many years of fun and many miles.. Ryan |
#80
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Re: Initial hesitation
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I fixed my starting issue last week...it was the wire going from my negative battery post to underneath the battery where it terminates/grounds to the frame. It starts PERFECT now. Last edited by RisingPhoenix; 06-16-2018 at 06:17 PM. Reason: Start issue... |
#81
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Re: Initial hesitation
You'll have to forgive me it's been a hot min since I read much on the SVX.
But I do recall the canister develops cracks or leaks over time. and yes it's another source of the elusive surging idle. more or less sounds like you have a leak somewhere and You've found it. there's also an Iris valve buried in the intake that causes issues when dirty. but since it's been so long since I looked at how things were routed I'd say look up some of the scans of the technical manual of intake and vacuum routing. I know there are MANY posts covering the EGR, and Canister as well as lines. but right now my knowledge of what lines go where and how they are routed is a bit limited. Be careful with some as they get VERY brittle. pcv is buried in the middle plenum under the decal plate and has a shaped hose, easiest fix ( heater hose and be done. the rest of the connections on the valve covers and other ports just too easy to grab a bulk cut of silicone. might be easier. I'd also post on the facebook pages for the group as many members are active. I've kinda been out of the game since I lost mine. But yeah I recall some info on the canister more or less goes bad and cracks form around it. Biggest demon with this car is things just get OLD brittle and rot. Rubber rot plastic hardens and snaps. Ryan |
#82
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Re: Initial hesitation
Thanks Ryan. I sure hope it's just the canister for a simple fix. Another question I have for you though: Would air leaks in this canister cause a drop in P.S.I. pressure in my gas tank also?
Its obvious that the poor idle started the same time I lost P.S.I. tank pressure just months ago. Just a fly-by question: Would coating the outside of the charcoal canister with RV sealant or Flexseal work for a temporary fix? And, do I need to replace the Purge Control Valve also? Where is this Purge Control Valve located? To add, yes I did replace the Valve Cover hoses in 2001 (about) with the original SVX OEM factory hoses (breather hoses) since the old ones on the car were cracked and hard as a rock. All good there!! Upon further thought, I should be able to plug off the RETURN? hose to the charcoal canister to get my idle working normally without any issues. Since I'd still have that inlet plugged into my charcoal canister, the fumes should burn off in the engine just as efficiently in my view. Last edited by RisingPhoenix; 06-17-2018 at 07:38 AM. Reason: Would this work? |
#83
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Re: Initial hesitation
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Taking off that Plenum is costly since the intake gaskets have to be replaced each time and carefully re torqued by a skilled professional. IDLE FIXED!! So, I made me a silicone plug using bathroom white caulking sealer (made by GE- 100% Silicone) and twisted it into the return (suction) side of the charcoal canister hose, taped it on securely with electrical tape and let it sit on top of canister, started car (VERY strong start, it was instant) barely any blue smoke from the tailpipe this time and let it warm up. PERFECT idle. Drove my awesome 1992 SVX with 298,000 miles on it for about 5 miles, EXCELLENT power, very smooth, no power drag in any RPM or car speed. VERY happy. I suspect my Purge Control Valve is M.I.A. though plugging the return line seems to bypass it. OH, haha. No surges on (getting less as I drive it) on acceleration anymore..very pleasant ride now. �� UPDATE: My CHECK ENGINE light no longer turns on/off like Casper The Ghost on a 'spook mission' Last edited by RisingPhoenix; 06-17-2018 at 02:23 PM. Reason: Awesome!!! Idle fixed!! |
#84
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Re: Initial hesitation
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Now I just need to borrow from someone to buy a new Secondary throttle cable. (The short cable hooked up to the vacuum thing on the firewall) I'm sure those cables aren't cheap. |
#85
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Re: Initial hesitation
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#86
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Re: Initial hesitation
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Aftermarket somewhere?? Maybe I'll check the truck shops. |
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