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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / April 2007

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95 Z-28 hard starting, but runs okay

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LinuxTester - 29 Mar 2007 22:37 GMT
afternoon folks !

1995 Camaro Z-28, 350V-8 /auto tranny, 144k miles, 20k miles
on plugs/wires, 5k on air filter/oil change. running "mid-grade" gas.
bought the car at 95k miles - no problems. weather around here
is now hovering in the 70s-80s.

up until a week ago, i would simply turn the key and she would
start up almost immediately. it was rare i had to use the gas.

now, about 300 miles later, as i turn the key, the engine cranks
and cranks an cranks. as is normal reaction, i pump the throttle.
it takes probably 30+ seconds of cranking before i get any sort
of response (i.e. engine wants to finally fire up).

oddly, when there is a glimmer that the engine wants to start,
i lay off on the gas and let go of the key. the engine fires/turns
"slowly" (ie - coughing), as if it's firing on 5 or 6 cylinders. and
as
if by magic, the engine roars up to normal idling as it did all along.

once the engine has been running for a couple of minutes, i put
her in gear and move on down the street. at a stop sign, she
runs a bit rough, as if missing a cylinder, but once moving, say
normal cruising at 35 on local roads, or 70 on highway, she
runs "normal".

once warmed up, starting the car isnt instantaneous, but not a
real issue ... the 'hard starting' is mostly after sitting overnight.

although i havent started troubleshooting yet, i plan to:
* check all plugs/wires (ohms)  and check wires to sensors
  for proper connection.  check relays
* change fuel filter and clean air filter.
* check fuel pressure.
* check sensors for proper reading.

i'm thinking along the lines of a fuel-related problem, but i could
be
off on that. the only other obvious issue would be ignition related:
coil, wires, or distributor cap/rotor (not sure if the rotor/cap has
ever been changed).

is there anything i'm missing?  anything special i should concentrate
my efforts on? from the description of the problem, is it fairly
obvious
where the problem lies?

thanks for any feedback you may have!  michael
edsinmt@msn.com - 01 Apr 2007 08:14 GMT
> afternoon folks !
>
[quoted text clipped - 45 lines]
>
> thanks for any feedback you may have!  michael

Have the fuel pressure checked... I'll bet it is a bad fuel pump as a
bad pump will "bleed" down over night and have some problems
maintaining fuel pressure when it is hot.  Same issues with my Mustang
some time back.
 
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