losing power in 4th & 5th in 1st 40 minutes
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losing power in 4th & 5th in 1st 40 minutes
I love this 84 GSL except for this problem which is making me crazy! Starts well cold, drive locally up to 3rd gear with no problems, grab coffee, etc. then hit the freeway. Stand on it. 4th...5th...suddenly feels like fuel starvation, no power, loses speed, rush hour traffic honking, pull over & fume(me). Replaced fuel pump, new filters,seemed fixed.
Weather got colder, problem came back. Colder the weather, more noticable the condition. Checked choke, replaced plugs, wires, rotor, swapped coils (from my other 7 project). Better until this morning, managed to nurse it to where I had to go & back but had to stay under 3500 rpm in 4th or it will die. 5th kills it. The clincher is that after 45 minutes it seems to be fine until the next freeway run from cold. Any advice greatly appreciated!
Weather got colder, problem came back. Colder the weather, more noticable the condition. Checked choke, replaced plugs, wires, rotor, swapped coils (from my other 7 project). Better until this morning, managed to nurse it to where I had to go & back but had to stay under 3500 rpm in 4th or it will die. 5th kills it. The clincher is that after 45 minutes it seems to be fine until the next freeway run from cold. Any advice greatly appreciated!
#3
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45 minutes is a long time to have your carb iced up, especially if it you have a Mazda "heated" manifold. I'm assuming you used a stock filter when you replaced it? If you did, take it off, throw it away and replace it with a much larger capacity unit. Something off a Rustang or equivalent.
#4
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I read that as after 45 minutes of sitting, you come out and jump in the car and it runs fine.
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#8
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Hey, it's fixed! Thank you all for your input. I went through all the suggestions, took off the fuel filter & checked for rust, etc. A little there but not enough to starve the f/p. As I lay there looking up at the check & cut valve wondering if it could be plugged I noticed what seemed to be a restrictive bend in the hose from the valve to the filter. Compared the hose to the other 7 project car.....different hose! Re-routed hose & eased the bend out, checked fuel volume, much increased, road test, & problem solved. At some point someone must have said "this hose should do." I'm still not sure why the 40 minute part but happy now!
Thanks again.
Thanks again.
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