When my engine is under a load (going up hill, passing on highway or just
trying to get above 55). It drops off like its not getting any gas.
Fuel pressure is good 60 psi
EGR is good
Plugs and wires good.
any ideas . Tommorow Im going to replace the coil because at night
(darkness) i can see a small blue spark when i mist it with water (windex) .
If that doesn't work im going to open up the top of the fuel injection and
look for leaks etc. (like recommened a few months ago on this newsgroup when
i was having rough starts...but they went away.)
92 blazer 4.3l "W"
line kickrd of comeing apart inside?
Doesn't work that way. Fuel flow is the same at idle or WOT. Whatever the
motor doesn't use @ idle just gets returned to the tank. Mechanical pumps
increase flow with RPM, electrical pumps do not.
The only way you would have decent pressure and little volume would be the
fuel lines covered in shit on the inside (like cast iron plumbing in old
houses, they close up from the inside) This is IMPOSSIBLE in a fuel system.
So Mr. Smarty Pants, any other lessons for me?
I've had several antique cars with restricted fuel lines, just like cast
iron water pipes, but it was from varnish buildup instead of lime/scale
buildup. I'm sure that's not the case with a '92 Blazer, though.
Yeah I've seen it on a few OLD vehicles that have sat for 20+ years with gas
in the tank and lines, but not in a 92' Blazer. Plus, if his lines were
restricted, he'd be getting an 02 lean DTC (Code 13 on OBD-I). Weren't 92'
Blazers TBI and not CPI? He said his fuel pressure was 60 psi which is
great for a CPI system, but ludicrous for a TBI system.
OK ...........seems to be running a little better but it also got real warm
up here lately(not sure if the cold wheather has any thing to do with it)
i've got new wires and plugs and coil.
First new Plugs and wires. Then new coil. all are spaced proper no arching.
Like i said Fuel pressure is good(60psi). Previous owner (freind) put new
pump,filter,and tank in it.
But it won't hurt to change the filter again. ($cheap)
Also like i said in another posting, i removed/checked EGR valve. It was a
little dirty but not as bad as i hoped.
Check your "Epileptic" Converter. Classic symptoms of a clogged
converter are 1. Starts and idles ok. 2. runs good for a few minutes. 3.
Bogs down when accellerating. Feels like it is not getting gas.
Mr goodwrench, or a good shop can pull one of the O2 sensors and connect
a pressure tester to confirm.
Martin Riddle wrote:
GREAT NEWS..............I replaced the coil and it seems to be running
great. Under a load , up hills and passsing on the highway. Starts right up.
So that seems to have been my problem. $16.99
It still runs a little rough when sitting in park.(chugga chuagga rumble
rumble). Im going to try and turn up the idle a little(?) but i guess i
can't ask for everything at 155,000 miles.
Thanks to all.
any ideas to tweak the roughness away keep sending.
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