Yesterday, I went out to start it after it had been sitting for a few
hours and it cranked, almost started for a couple of seconds, but died.
After repeated attempts it turned over but would not start. I tried
starting with the accelerator pressed, but no luck. I waiting about
about 15 minutes and it started, I drove it 5 minutes to the store and
after sitting for 5 minutes, had the same problem. Over an hour period
of retrying, allowing 15 minute intervals, it still didn't start. I
got a ride home and went back after dinner and after running for a
couple of seconds, it died. This time, after about 15 minutes, I got
it started and drove it home.
I have had this happen maybe a dozen times over the last year, but it
always started after a short rest. If it means anything, yesterday, it
was over 100 degrees in the sun when I was having problems. This
morning at 6:30 AM, it started right up.
The car, owned by my father who purchased it new, has been well
maintained but has not had a tune up for a while. It sat in a garage
for 6 months last year until August and also, I stored it in a garage
over the winter until April. I started it up every couple of weeks
during the winter. Last month I had the air conditioning converted and
also replaced the compressor. The only other problem I have is the
blower always pushes air out of the upper vents, even when I select the
button for the lower vent. I don't know if that could be related.
Thanks for any ideas.
Steve Canham
T.G. Lambach - 30 May 2006 16:57 GMT
After failing to start, when it does start, does it start normally or
with stumbles and misfires?
If "normal" I believe the fuel pump relay is the prime suspect. That
relay is the switch for the car's electric fuel pump and such relays
fail with age so the electric fuel pump doesn't run and there's no fuel
to start the engine.
If it starts with stumbles and misfires the fuel system on the engine
needs work.
The heater - a/c air distribution is due to one of the ducts' vacuum
powered air distributors being broken or disconnected.
Steve.Canham@gmail.com - 30 May 2006 17:19 GMT
When it DOES start it runs normal, so I will look at the fuel pump
relay. Also, will look for problem with the air distributors, but that
in itself is not a major concern for me. Thanks very much for the help.
Steve.Canham@gmail.com - 30 May 2006 18:35 GMT
Went home for lunch (92 Degrees) and she started right up. The fuel
pump relay could fail intermittently? Is the heat related to the
problem?
T.G. Lambach - 31 May 2006 01:36 GMT
Relays become intermittent - as yours has. Many also fail while driving
- motor suddenly quits and may restart normally - or not!
Tiger - 30 May 2006 22:12 GMT
Classic symptoms of hot start problem... basically you got internal fuel
pressure leak. Most culprit is the fuel accumulator... one side has rubber
hose... pull the hose out... if fuel keeps coming out of the accumulator...
it is defintely bad.
Another source of leak is on the top of fuel distributor... called
compensator piston... there is an oring in there that will wear.
Last possibility which is also high... fuel pump relay... look at the date
stamped on it... if it is same year as your car, replace it... they usually
only last about 14 years...
Steve.Canham@gmail.com - 31 May 2006 14:41 GMT
Steve.Canham@gmail.com - 20 Jun 2006 13:01 GMT
I replaced the fuel pump relay and it has started fine for the last 2
1/2 weeks until 2 days ago.
Now I have another problem. When the engine is cold, I must hold the
accelerator to the floor for the engine to start. This morning on the
way to work, after about 4 miles, the engine died as I turned a corner,
but I was able to restart it without pressing the accelerator It has
been running rough intermittently and almost died one other time, but
pumping the accelerator kept it going and then it started running
smoothly again.
Tiger - 21 Jun 2006 17:22 GMT
When is the last time you changed the O2 sensor?
Guenter Scholz - 21 Jun 2006 18:04 GMT
>When is the last time you changed the O2 sensor?
Sorry to but in. I've recently replaced the valve guide seals on my
'89 300e that had been starting perfectly to that point. After the change,
now oil fouling on plugs hugely reduced but have noticed (my wifes car so that
I don't know if it was an 'immediate' consequence) that it is 'harder' to
start now. I mean, one has to crank a few seconds before it runs - before
it started essentially immediately. could the O2 sensor be responsible for
this somehow I wonder? the sensor is about 150k miles old BUT when I checked
the 'readout' under hood the sensor seemed to voltage 'cycle' as is to be
expected.
cheers, guenter
Steve.Canham@gmail.com - 21 Jun 2006 19:25 GMT
> When is the last time you changed the O2 sensor?
I don't have a service record prior to buying the care months ago.
The car died 3 time on the 10 mile trip home from work yesterday. I
have it parked now until it is repaired.
I posted this same question on the MBCA forum and someone asked the
same question about the fuel filter.
Thanks.
Tiger - 22 Jun 2006 15:28 GMT
There are a couple of things that affect this... so you can't simply just
swap parts because it gets very expensive.
I would start out by inspecting the fuel system first... is there enough
pressure? Possibility of fuel pump going bad... Fuel filter can do the
problem but is very rare... you really need super dirty fuel to do this. The
fact that you couldn't start when cold is the key symptom... so I'd suspect
the fuel pump... but I would check with fuel pressure gauge to validate this
diagnosis.