Christobal
Member
- Joined
- July 23, 2007
- Messages
- 45
- Reaction score
- 0
- City, State
- SoCal
- Year, Model & Trim Level
- 93 XLT, 03, 2 wheel drive
93, 216K original motor.
Just put NGK fine electrode platinums in, removed Autolite platinums with about 30K or so on them, ran fine, but I notice it starts cold or warm easier with the new plugs, wasn't hard to start before but maybe 1-2 seconds longer crank and motor would stumble slightly for 1-2 seconds after light off whether hot or cold, can only attribute improvement to these new plugs of different/better design.
It will start and run smooth at that normal elevated idle cold or hot, 1200 rpm or so and seems smooth, then settles into this lumpy bump miss 1-2 a second, don't notice any or much roughness at elevated rpms especially when under load so I do not think it is ignition related, wires been in there a while but should be fine, moved some wires around, swapped with new, no change. Plugs have normal good brown color all the way around, gaps are good.
I notice in conjunction with this over last several thousand it seems to get poorer mileage especially around town when short tripped as compared to when on freeway trips the farther the better.
No CEL ever. I also cleaned the MAF element, looked really clean to start, no difference. Unplugged MAF to clean, but also removed battery cables and touched together. Seemed like it may have helped slightly for a short period but right back to same 'out of balance type lope' Seems worst at times at one rpm vs another, rougher at say 1000 rpm when warm than at 700 or 1200 etc.
I have read a little about fuel pressure regulator and thinking possibly something EGR related, like EGT on at light throttle low rpm when it shouldn't be, but never get a check engine light.
Any ideas? The lack of CEL intrigues me though I guess it could be burned out, i'll look for it if it is supposed to come on during the start sequence where a bunch of lights are on.
Something I forgot to mention when I first posted, so on edit. It needed a water pump for months. It was leaking from the water pump seal badly, so most of the fluid in the cooling system would not stay in it. I would move it from the driveway to the street now and then for exercise. I only ran it for 30-90 seconds or so at a time. I noticed it seemed to go into a limp mode of sorts with little coolant in it, presumably to make it harder to burn it up or otherwise hurt the motor? It had little power, if you tried to rev it much it wouldn't accelerate. If I put water back in it, even though it would leak out, rev/power issue was gone. While it was in this limp mode as I call it, it would seem to run mildly rough kind of the like the problem I describe with it now that everything should be back to normal. Strange.....
Just put NGK fine electrode platinums in, removed Autolite platinums with about 30K or so on them, ran fine, but I notice it starts cold or warm easier with the new plugs, wasn't hard to start before but maybe 1-2 seconds longer crank and motor would stumble slightly for 1-2 seconds after light off whether hot or cold, can only attribute improvement to these new plugs of different/better design.
It will start and run smooth at that normal elevated idle cold or hot, 1200 rpm or so and seems smooth, then settles into this lumpy bump miss 1-2 a second, don't notice any or much roughness at elevated rpms especially when under load so I do not think it is ignition related, wires been in there a while but should be fine, moved some wires around, swapped with new, no change. Plugs have normal good brown color all the way around, gaps are good.
I notice in conjunction with this over last several thousand it seems to get poorer mileage especially around town when short tripped as compared to when on freeway trips the farther the better.
No CEL ever. I also cleaned the MAF element, looked really clean to start, no difference. Unplugged MAF to clean, but also removed battery cables and touched together. Seemed like it may have helped slightly for a short period but right back to same 'out of balance type lope' Seems worst at times at one rpm vs another, rougher at say 1000 rpm when warm than at 700 or 1200 etc.
I have read a little about fuel pressure regulator and thinking possibly something EGR related, like EGT on at light throttle low rpm when it shouldn't be, but never get a check engine light.
Any ideas? The lack of CEL intrigues me though I guess it could be burned out, i'll look for it if it is supposed to come on during the start sequence where a bunch of lights are on.
Something I forgot to mention when I first posted, so on edit. It needed a water pump for months. It was leaking from the water pump seal badly, so most of the fluid in the cooling system would not stay in it. I would move it from the driveway to the street now and then for exercise. I only ran it for 30-90 seconds or so at a time. I noticed it seemed to go into a limp mode of sorts with little coolant in it, presumably to make it harder to burn it up or otherwise hurt the motor? It had little power, if you tried to rev it much it wouldn't accelerate. If I put water back in it, even though it would leak out, rev/power issue was gone. While it was in this limp mode as I call it, it would seem to run mildly rough kind of the like the problem I describe with it now that everything should be back to normal. Strange.....
