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Post by Brenticon on Jul 3, 2018 8:30:29 GMT -8
After babying the beast, I was having some issues on the hills of BC. Thinking it was the tires and tranny, I started rethinking the conversion. Sitting in buddies garage in Kelowna I started checking things and found out my engine won't rev past 3200 rpm.
Here's what I've posted around the internet
recent complete build. approx 5000 kms
Its lifted 2 1/2 inches with 215/15 bfg's
I thought it felt sluggish because of the tires, but recent realized it wasnt rev ing over 3000 rpm
Sitting, in neutral, I can accelerate up to 3500 rpm, at 1/2 throttle/pedal, and then if craps out and drops and stays around 3000
Ive ......
swapped out three different dizzies, with different variations of new points, old points, condensors and electronic
swapped out coils
swapped out air flow sensor
pulled and cleaned throttle body
swapped out dual relays
checked compression
removed muffler
checked for full throttle cable
check fuel pressure
changed fuel filter
still same issue ..... ugh
you guys got anything?
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Post by Brenticon on Jul 3, 2018 8:35:13 GMT -8
So, I've talked with many VW golf, including Russ, and we are stumped. The only thing I haven't tried is changing the computer.
John cane up with a great thing to check also, three wiring harness. Could it be, that one wire going to the afm isn't connecting? Currently I'm in Summerland, trying to get into a well established VW shop. Hopefully they can squeeze me in. For now, I need to find a camp spot
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Post by 77eurobus on Jul 3, 2018 10:51:39 GMT -8
Brent, I know you checked the static fuel pressure but I would also be inclined to see what the pressure reading is when the motor is under
load to make sure the pump and fuel regulator are working to spec at higher rpm. I had a very similar issue when I completed my Cobra, all was fine until higher rpm. I had serrated the fuel line inside when I mounted the fuel filter and it was restricting the flow.
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Post by mitchy965 on Jul 3, 2018 12:11:38 GMT -8
you don't have one of those funky rpm limiting rotors do you??
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Post by Brenticon on Jul 3, 2018 12:19:32 GMT -8
No, it doesn't have one of those to rotors, and yes to testing idle and accel as per Bentley manual ..
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Post by wcp on Jul 3, 2018 14:38:32 GMT -8
how is your end play?
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Post by tony on Jul 3, 2018 17:54:52 GMT -8
I said , PARDON!  |
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Post by Brenticon on Jul 3, 2018 18:23:46 GMT -8
It was built by a shop in Vancouver, so end play better be right
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Post by mitchy965 on Jul 3, 2018 21:07:09 GMT -8
maybe some more info on the symptom, what happens when it hits 3000. any backfiring or missing or does it just nose over and not rev out?? couple of ideas came to mind, you could put a noid light on one of the injectors and try to rev it up to see if the light dies out (ECUs are very durable). i worked on a SBC once that wouldn't rev passed 4400 rpm no matter what carb/dist/pump was tried. after much testing and substitution i discovered severely weak valve springs. the engine builder supplied the springs and sold them as high perf Z/28 replacements but i could push them down with my thumbs.
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Post by Volktales on Jul 3, 2018 21:09:56 GMT -8
End play should be ok as it was done some time ago. Generally end play gets bigger if something is going wrong. How about this idea. Take off your air filter housing and get a can of flammable brake clean, or some gas in a spray bottle. Rev it up and when the "governor" kicks in, spray some fuel into the open intake. If the engine revs up, then at least you know you have some sort of fuel delivery problem. This worked to help diagnose my Type 3 when it was not running well. If the injectors are not delivering enough fuel due to lack of pressure, or not enough "on time" commanded by the computer, or a failure sensor causing bad info to be sent to the computer, can all cause this. You did check ALL your grounds, did you??? And your ignition switch is giving full voltage to that coil??? Given you have a hard start relay on your bus, the ignition switch should be a potential suspect. Just temporarily connect a jumper wire from your battery to your coil positive and see if this makes any different. Note you must remove that wire to shut off the engine... Did the rockers look OK??? Hope it works out...
And yes Tony, The Champ was probably the best part of the old Rock 101...
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Post by Brenticon on Jul 4, 2018 6:03:56 GMT -8
It runs great, but poops out at 3400 rpm. It flutters slightly at top rev, then drops and stays at 3000-3200 in neutral and driving. No backfire, no stumbling while getting there. It actually drives quite awesome.
Just no top end
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Post by Brenticon on Jul 4, 2018 6:04:24 GMT -8
Will be checking those other suggestions also
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Post by wcp on Jul 4, 2018 7:39:33 GMT -8
Mitch brings up a interesting point. That would explain the RPM-related issue.
can you pop off a valve cover and have a look?
It is possible to change the springs with the heads on. you just need compressed air and at least a rubber tipped blowgun. it'd be a 2 person job, but should be doable.
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Post by mitchy965 on Jul 4, 2018 9:38:22 GMT -8
don't even need air Paul.i have used clothes line in the cylinder on the side of the road. a clean (no burrs) 18 inch chunk in the plug hole and roll the piston up. just don't put the hole line in!!
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Post by mitchy965 on Jul 4, 2018 9:39:53 GMT -8
Russ is probably correct....missed something on Ign/injection.
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