1996 Astro van starting issues

#11

Hi Steve:

If it's a TBI he can hook a timing light to the number one cylinder and
observe the spray on driver's side injector, and on the number two cylinder
for the right side injector.

I think the sensor, as he calls it behind the TPS might either be the Idle
Air control or an Intake Air Temp sensor.

Sounds like maybe out all of the shit that was changed, one bad part was
replaced, and a defective new one was put in.

You need to do diagnostics. Not shit parts at it, but I would say but a
vacuum gauge on it, and run it into the cab, and maybe you'll see a vacuum
fluctuation. Maybe a loose converter core. Do you have the ability to check
spark KV?

RK
"Steve W." <csr684NOT (AT) yahoo (DOT) com> wrote

Quote:

BLB wrote:
On May 27, 4:55 pm, BLB <Brian1... (AT) gmail (DOT) com> wrote:
1996 Astro Van. cranks, good spark, good fuel, may idle, but falls on
its face when throttle is touched (like it is starved for fuel). Once
you get it to actually start & idle, it idles fine & will crawl around
the parking lot in gear without problems. But hit the gas, and it
will stall.

If you crank it over & over, it will not start. You need to bump the
key over & over to get it to start, or else it will flood. Will not
start in "clear flood mode"

Replaced:
Fuel pump
Fuel Filter
Fuel regulator
Fuel Injectors
Tested fuel pressure, very good
Throttle position sensor
Coil
Electronic spark control
Wires
Cap & Rotor
Plugs
Quadruple checked firing order.
ECM
Cam sensor
Checked for vacuum leaks around the intake.

I am at a loss of what to do next. Anything that could affect the
running of this truck in open loop has been replaced (as far as I
know)

On the scanner:... No OBD2 codes or faults. Everything is within
parameters. No exhaust restrictions, no intake restrictions.

Ok you state that if you crank it it won't start and instead it floods.
But if you bump it it will start and may idle OK?

How do you know it floods? Pulled the plugs and they were wet? ( I hope)

When you do get it to run and step on the throttle how does it die? Does
it flood out or does it just QUIT.

When you say you changed the injectors is this a TBI truck or a MPI?
Missed that if it's there.

When it quits do you see fuel still coming out of the injectors (if it's
TBI)as it shuts down or do they taper off and stop spraying?
If you spray some fuel into the intake as you open the throttle what does
it do?
What does the coolant temperature sensor show with a cold engine?

For testing purposes disconnect and plug any external vacuum connections,
like the one for the EVAP system, the brake booster and whatever else. Any
change?

What condition are the engine and chassis ground straps in?

--
Steve W.

#12

i see no mention of testing or replacing the map sensor or mass air
flow sensor,,what ever type you have,,try it it might just run then,

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1996 Astro van starting issues

4x4 Chevy/GMC Trucks 4x4 Chevy/GMC Trucks Discussions (alt.autos.4x4.chevy-trucks)

Re: 1996 Astro van starting issues - 05-31-2008 , 02:38 AM

Re: 1996 Astro van starting issues - 06-07-2008 , 03:02 PM