Technical aspects of automobiles

Archive for June, 2010

88 Ford Bronco II shuts off

I’m working on a 88 Ford Bronco two that randomly dies and won’t
restart.  So far I’ve replaced the IAC because it wasn’t working, the
fuel filter because it was on backwards (with directional flow), and a
cleaned out the throttle bodies because of carbon buildup.  The fuel
pump seems to put out 30psi consistenly the three times I tested it.
And the ignition system seems to be in good shape.  My guess is the
fuel pump but I dont want to put it in if its still giving good
pressure.  Any other ideas?

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GM Passlock I or II Disablement

You can do this without adding a remote starter.


The following is a procedure to disable Passlock I or II Systems for vehicles
in which remote start/stop system installations are required. This procedure
is required because a remote start system will not function with the current
Theft Deterrent System (Passlock) which is included on many  1996 and up GM

Please note that this modification is intended to be used only in conjunction
with the installation of a remote start/stop system and does not provide a
procedure to install a remote start/stop system.

If an attempt is made to start a vehicle by a means other than a key rotation
in the ignition switch, the Body Control Module (BCM) will interpret this
start as a vehicle theft and disable the fuel injectors.

A minor wiring modification may be made to allow the vehicle to be started
remotely. This modification includes adding a switch to allow the customer to
select “ON” to allow remote starting or “OFF” for normal Passlock operation.

CAUTION: When this modification is performed and the switch is set to the ON
position, the theft deterrent feature will be disabled. When the theft
deterrent is disabled the SECURITY/THEFT SYSTEM  telltale will light up
indicating that the theft deterrent system is NOT functioning.

Refer to appropriate GM service manuals and/or SVMQP Electrical Guideline
Manual for instruction on splicing and electrical connections.
1. Select a suitable on-off switch (see note below) which will be used to
enable the Passlock System. Mount the switch in a location such that it is
accessible to the driver and will not interfere with normal vehicle operation.

NOTE: This is an extremely low current circuit (approx. 7mA), it is therefore
very important that a high quality, low energy, fast acting switch be
for this application.
2. Turn the ignition switch to the OFF position.
3. Locate the Main Ignition Switch Harness in the Column.  GM’s Passlock
System wires exit the Ignition Switch Tumbler together and then join with the
Main Ignition Switch Harness.  (See or  and select your Make, Model and
Year for wire colors and clues on the quickest way to access these wires.)
4. Locate the Yellow Passlock Data Wire which is included in a bundle of
three tiny (20 GA) wires wrapped in friction tape.
Cut this wire and splice a 0.5mm2 (20 GA) yellow wire to each end of the cut
Keep wire length to a minimum. Route modification wires clear of moving parts.

Connect the yellow wires to the switch such that the contacts are OPEN when
the switch is in the ON position.
5. Turn modification switch to the OFF postion (contacts closed).
6. Start vehicle to verify normal operation. If engine “cranks but will not
recheck the switch position (contacts should be closed), wire connectors and
modification wiring.


To enable remote start:
Start the engine with the ignition key (modification switch must be in the
position). Turn modification switch to the ON position (contacts open). The
SECURITY/THEFT SYSTEM Telltale will light up indicating that the Passlock
System is inoperative.
Once the SECURITY/THEFT SYSTEM telltale has been on for at least 5 seconds
the vehicle can be turned off and then remotely started.

To disable remote start:
The Passlock System can be reactivated by turning the modification switch OFF
(contacts closed). Vehicle can either be running or off when this is done.

Please note that the VCM/PCM will record Diagnostic Trouble Codes (DTCs)
related to the security system when the modification switch is in the ON
position (circuit open). This is due to the way that the VCM/PCM interprets
this condition.

Any condition which removes battery power from the Vehicle Control
Module/Powertrain Control Module (VCM/PCM) (e.g. dead battery, disconnected
harness connectors, etc.) will prevent the vehicle from being restarted. If
the engine exhibits a “cranks but will not start” symptom, place the
modification switch in the OFF (contacts closed) position. This will
reactivate the Passlock System and allow the vehicle to be started with the
ignition key.


Proud Member of The Anti-Passlock Club

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testing for diesel in gasoline.

We have a suspicion that a car we are trying to get started may have
diesel in the gas.
Is there a simple way of telling? Some type of separation in a glass
perhaps, or maybe
something entirely different that can be added to stimulate a
separation? Possibly some
type of a volume displacement technique? The gas has somewhat of a
sweet smell
and nobody has volunteered to taste it.  : )~
Thanks in advance.

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Cargo liner that covers entire rear area of minivan

I just got a new 2006 Dodge Grand Caravan with Stow&Go.  I am looking
for a cargo liner that goes all the way to the rear of the front seats.

 All the ones I see (Huskey, Catchall, Lloyd, Herrington, etc.) go to
the 2nd or 3rd row seats, but not to the back of the front seats.  I am

trying to use the mini-van for general work I have used a Ford Ranger
truck for in the past.  If I had a liner like these manufacturers make
that would cover the entire area back of the dirver’s seat, it would
take care of things like a 4 X 8 sheet of plywood, bicycle storage and
other rough jobs that might scratch up the area behind the driver seat.

Does anyone have some experience with these liners and can recommend
the best one?  Hopefully you can identify one such as I describe.

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diesel fuel

dear Sirs

i am a phd student from Durham university , i am doing a phd in
computer simulation of disel fuel with an oil company sponsor.

i wonder if some one can help me to find some website or books i can
read for understand exactly what is the diesel is made  of?
i know mixture of hydrocarbons and aromatic, paraffin

also additive like EVA, does anyone know what the chimical structure of

I hope someone can help me.


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Tiny windshield crack

I bought a used car yesterday.  I guess I should have test driven it in the
sunshine, because today I found a 1/8" crack in the windshield.

Any chance it won’t get any worse?
Can it be fixed?

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Battery dies in car

Anybody got any ideas about where to start looking for a problem where a
good battery goes dead in a matter of a few hours setting my car?  1988
Taurus. Runs great, all fuses intact, just draws battery down real fast.

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TPMS tire inflation sensor triggering and diagnostics tool

Tire Inflation Positioning Switch TIPS Pro Service Tool
Opportunity (Tire pressure monitoring system -TPM-)

The new federal law requiring new passenger vehicles to be outfitted
with Tire Pressure Monitoring Systems (TPM) has produced a wide
variety of market solutions. Many automobile manufactures have
selected the direct approach that incorporates the use of transmitters
built into the valve stems that transmit information (Inflation
pressure, temperature, etc) to the engine control module. The majority
of the direct tire pressure monitoring (TPM) sensors installed in the
wheels of passenger car tires today need to be re-trained each time
that the tires are rotated.

Industry wide, there are a number of systems manufactured today with
varied techniques including magnetic and electronic frequency sensor
triggering as well as multiple frequency bands used to carry the
transmission signal to the engine control module. While TPM
manufacturers have designed service tools for their specific sensor,
this will result in the requirement for service facilities to purchase
multiple TPM service tools.

The TIPS Pro tool is a patent pending product that has been designed
to universally initiate all known tire sensors available in the
marketplace today. The TIPS Pro tool accommodates both magnetically
and electronically triggered sensors so one tool is all you need.

Why purchase an initiation tool for each and every sensor in the
market when you can purchase the TIPS tool that will service all
your needs.

For information or to purchase the TIPS Pro TPMS, contact:
C&S Electronics, Inc. ユ 3667 W Auburn Rd, Rochester Hills, MI48309
(248) 852-1537 ユ
Web site:


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peugeot 406 key programming

hi i have apug 406 exec 2.0 turbo p reg  recently bought a spare blip key rf
type off ebay  tried programming in  by turning ignition on press main
primary key large button within 10 secs press large button on secondry key
but doesnt work  can anyone help  many thanks …brian….

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Reverse coolnat flow systems

Can somebody point me in the direction of a matrix or source that list which
engines are reverse flow?


Timm Sheehan

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