Stock voltages for comparison:
4.4v-4.6v = Engine OFF
1.4-1.6v = Idle
2.2-2.6v = 1/4-1/2 throttle
There's definitely a problem Rich. Give me a call: (512) 507-8303
(Alright...it's on my business cards anyway...just don't abuse it -
please.) :)
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net] On Behalf Of Wisotzkey, Rich
Sent: Saturday, June 02, 2001 4:10 PM
To: 'dakota-truck@buffnet.net'
Subject: RE: DML: Vacuum Help Please
Ok,
Here's the details on the MAP sensor.
Vacuum was slightly lower. On initial startup; about 8.5in. After
settling out; around 10in. ±.5in.
MAP Voltage Readings
Input voltage: 5.1v
MAP Sensor Readings
4.6v Engine off
2.8v Idle (650-700rpm)
1.3v Approx. 2000rpm
Rich
-----Original Message-----
From: Bernd D. Ratsch [mailto:bernd@texas.net]
Sent: Saturday, June 02, 2001 2:42 PM
To: dakota-truck@buffnet.net
Subject: RE: DML: Vacuum Help Please
Now that you clarify the " This doesn't work on the street. "
comment...hehehee....take a look at the MAP, and IAC solenoid (cleaning
mainly...disregard is already been done or new). It's a
"Special"...what did Bruce do? :)
One the MAP...with the lower vacuum reading at idle, you may be getting
too much fuel and not enough timing at idle. Here's why: The MAP port
on the TB normally reads about 2-3" lower than the manifold vacuum.
So...stock vacuum at the MAP port (Idle) is 12-14". Now, you're showing
11-12" at the manifold...that's about 8-9" at the MAP port. Lower
vacuum at the MAP designates a higher load (less timing/more fuel). Try
this...plug the MAP port on the TB and run a line to a vacuum port on
the manifold. See how she runs from cruising to (clutch depressed)
idle.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net] On Behalf Of Wisotzkey, Rich
Subject: RE: DML: Vacuum Help Please
Hi Bernd,
Two for one here, he-he-he.
#1 <snip>...
If you're running an aftermarket cam, a vacuum reservoir works for the
power brakes and other vacuum accessories. If this is a "stock
internals" engine...something else is wrong. :(
I haven't driven it enough to tell if I need a larger resevoir or not.
It's rather difficult since everytime you push in the clutch coming up
on a stop, the engine dies. (Not a cool Dak image either!) :'( I
believe this is the only real problem I have is with the engine stalling
at a stop.
The TB is a F&B "special", M1 intake, mildly ported heads, angle cut
seats and valves, Hughes 1828 cam, (valve springs and retainers also
Hughes), Crane pushrods and roller rockers, Mopar PCM and double roller
timing set, and of course headers and a cat-back. Think that pretty
much covers the essentials.
-----Original Message-----
From: Bernd D. Ratsch [mailto:bernd@texas.net]
Sent: Saturday, June 02, 2001 12:17 PM
To: dakota-truck@buffnet.net
Subject: RE: DML: Vacuum Help Please
#2 <snip>...
>From what you've described, it sounds like the cam is causing the lower
vacuum. You can reuse the TB gasket but soak it in some water for about
10-15 minutes first (thickens it up again) and then dry it and reinstall
it...upside down.
Cool trick on the gaskets. Never thought about that one. I can't flip
it over though with the M1 intake. It is not symmetrical. :'B
Still open to any and all suggestions.
Rich
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