Question about Cars & Trucks
1985, a relic, that is a very old car. 302 cu in engine?
80s cars are a force form H3LL , the VACUUM land.
some cars had these vastly complex Rube Goldberg, vacuum
smog controls. (no electronic so they used, VAC BS)
you will need a shop manual to work on it. it is that hard.
open hood, look up see that orig. vacuum map, cry.!
im online now at alldata dot com, there are 23 vacuum maps
in 1985 alone, for each model mustang and engine size,fed or califoria or Canada. what yours is , who knows. but that under sticker under the hood does state the this fact.
that is the beast..
what can cause, it, many , most are CARB engines.
most old cars , most of the smog parts are dead or missing.
so asking a web bunny to guess ,what wrong, not knowing all facts is a total shot in the dark.
This engine , also has the most complex EGR system ever made
Many models use a venturi vacuum amplifier in conjunction with the EGR system"
so the #1 stall reason for any car , is EGR. all cars. with EGR (most)
Ill stop here, because what Fueling and spark system used
on your car varies by my above stated factors (country,engine, state)
here is the quote for the fueling.
Most 1984-88 vehicles use the EEC-IV system. As is the case with its
EEC-I, II and III predecessors, the heart of the EEC-IV system is a
microprocessor. Unlike its predecessors, however, the EEC-IV
microprocessor is not properly called an Electronic Control Assembly
(ECA). Instead, the EEC-IV microprocessor is called a Powertrain Control
Module (PCM), by virtue of its added transmission control function." unquote
to work on this car, find out what size engine.
what vacuum system , under hood. "sticker"
what spark system.?
stalls ,all cars. with 1985 added
1: SMOG parts failure. in this year, its a sure thing, Complex is understated. spark delays, air injection, egr from H3LL ,
2: lost electrical power to the ENGINE CONTROLS.
3: lost compression as engine warms up.
4: needs a tuneup. (ouch in 1985 this is a near endless task)
5: bad spark.weak or timed wrong.
6: bad fueling (near endless testing in 1985 to find this)
many dealers at this time could not keep it running, a fact.
log in to alldata.com and read what you have and the 1000 of checks and tests.
if not in a smog zone, consider up grading it to
custom ECU EFI. $$$$
or run it off a Harley CV carb (lost power but runs every daY)
Some of these cars have dash pots.
on the TB or Carb.
that prevent stalls , as you:
cut the throttle
or the A/C cuts in.
some have air bleed devices, to force the AFR lean on cut throttle and cuts smog but if it sticks open , the engine stalls.
just a hint there, its far more complex.
Posted on Oct 15, 2013
Have you changed the fuel filter?
Posted on Oct 15, 2013
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Posted on Jan 02, 2017
SOURCE: 2005 Mustang GT idleing problem
may be it the problem of another throttle body.also check the ignition switch.
Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...
Posted on Aug 25, 2008
have your idle speed sensor cleaned,also checkd the air flow sensor located in the air cleaner housing,you best bet is to have it scanned for PCM soft codes(codes that wont turn on the check engine light on)
Posted on Sep 08, 2009
Testimonial: "Thank you, we will check this out when we get back to Florida in October. Thanks again."
Was the fuel pump checked out?
Have a scope put on it,to check for a worn armature. May also be binding up mechanically
Also check TPS Sensor data or scope it
Posted on Nov 04, 2010
There are several possibilities, but based on how you described the symptoms I suggest a profile igniton pickup. On these systems the failure usually begins as dropping a cylinder occasionally,like a misfire,mostly during high underhood temperatures,will manifest into stalling and finally into a stall with no resart condition. Symptoms are most likely to occur in summer. The pickup is inside the distributor and the distributor must be disassembled to install it,the trickiest part being the removal and installation of the distributor drive gear. They are iron and easily broken. The simplest solution is another distributor. The ignition modules typically do not fail in this manner,but this is classic for the pickup coil. A code for loss of pip signal should be present, it is possible for a code to not be present,though very unlikely. Having worked on these systems for years this would be my first area of diagnosis.
Posted on Mar 20, 2012
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