ENGINE DIE'S

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.)
thanks
92 blazer 4.3l "W"
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
bmaty wrote:

Sounds like the fuel filter or fuel pump (low pressure) to me...?
-marc
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

just
60 psi is well within spec.
Doc
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Does the fuel pres. drop when under load. Bad filter of weak pump? Fuel line kickrd of comeing apart inside?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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.
Doc

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

.
when
If it's arcing, replace the plug wires FIRST, then the coil.
Doc

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Doc Have you not learned you can have Pres. but very littlr Vol.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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?
Doc

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

system.
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. Dave
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

the
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.
Doc

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

.
when
Replacing a partially clogged fuel filter on my '95 S10 4.3l "W" engine fixed my problem of power loss under load. When I cut the relatively new filter apart, it was full of black particles.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
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.

just
(windex)
and
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

.
when
Ignition timing maybe? Loose hold down bolt? Might be a good idea to check it.
Happy Holidays
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
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.
KenG
Martin Riddle wrote:

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
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.

.
when
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
If it's auto, check the fluid level. My truck did the same....it was low on trans fluid. Cheers Willie

.
when
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Related Threads

    Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.