Date: Mon, 26 Sep 2011 18:30:13 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: HELP-- 45 MPH @ WOT ???
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If I think it's fuel delivery or fuel pressure...
I just drive the van with a fuel pressure gauge were I can see it.
I suspect it's not fuel.
or ignition.
Fuel injection..
you have not mentioned oxygen sensor ..
or Temp Sensor II.
my own 87 Wolfsburg went through a series of heebie-geebies recently ..
Went through a series of cutting out that was fixed with another distributor
..
but then again ...very poor throttle response.
I unplug the not-that-old looking oxygen sensor .
I have a steadily running van.
I get home...put on a new oxygen sensor ......
and I have 'smooth running' van with good power.
think more about the fuel injection is my suggestion.
fuel starvation doesn't fit your symptom quite ..
wrong mixture does though ..
or weak mixture ...
try disconnecting the 02 sensor as a quick test.
cap and rotor don't fit your symptom .............usually.
I see many bosch cap and rotors with many thousands of miles on them and
they're working fine.
Check the plugs ..
consider spark plug wires..
but your symptom fits 'fuel injection.'
----- Original Message -----
From: "TJ Hemrick" <x53gunner@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, September 26, 2011 2:26 PM
Subject: HELP-- 45 MPH @ WOT ???
> I'm going to throw this out there as I'm still having some trouble and
> perplexing trouble at that. I've been having some problems getting the
> van
> up to speed and holding speed on the highway. it starts, runs,
> accelerates
> fine. It's a little slow after 50 but right at 60 mph (4k), the engine
> just
> stops pulling. If I give it any more gas, she just winds down. I have to
> back pedal to get it up there and keep it there. It's a VERY fine sweet
> spot and I have NO power at that speed. People are blowing by me like I'm
> going backwards.
> Here's the crazy part, if I floor it, it bogs down and will ONLY do 45 mph
> and it has a very slight sputter to it.
>
> Here's the scoop: 87 GL, 2WD, Auto, stock 2.1, I COMPLETELY cleaned the
> fuel
> tank out for a fresh set of gaskets about 6 months ago, new fuel filter,
> new
> fuel pump, new fuel lines from bow to stern (dumped the firewall fitting),
> new FI clamps and hoses on the injectors, and has been running well (aside
> from marginal gas mileage).
>
> I've been through a few tanks of gas and a bottle of water remover so
> that's
> a non issue.--NO CHANGE.
> I swapped AFM's since it's quick, easy, and I have a few spares. --NO
> CHANGE.
> I swapped Air filters (for the same reason as above). --NO CHANGE.
>
> I've pretty much given up on a fuel flow or air flow issue as it's at the
> EXACT same speed/RPM range EVERY time that's plaguing me with the slowdown
> and it's ONLY when I dump her to the floor that it goes into the speed
> DECREASE. It's so counter intuitive to back off the pedal when you're
> trying to pick up speed. Especially when just one or two millimeters too
> much and now you're slowing down due to throttle position and that semi is
> right at your back door and closing fast!
>
> I'm going to check the cap and rotor but anyone have any other thoughts or
> heard/seen this?
> It's just so strange that it starts and runs fine at all other points. I
> guess I shouldn't completely discount a fuel issue but it's not like the
> new
> pump is cavitating ONLY at that speed and every time ONLY at that speed.
> I
> guess it could be a total fuel volume issue but how could it be, again,
> only
> at that almost exact same point each and every time? Seems too specific
> for
> fuel. Electronics are the only things I know of that can be so repetitive
> and exact. That keeps putting me back at ignition.
>
> Thanks,
>
> TJ
>
> Yes, I have spare ECM's and AFM's so playing swaptronics is not a problem.
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