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i have a 1990 ford ranger 4x4 with a 4.0 .its hard to start when cold. its starts fine after that and runs fine after you get it to start. thank.i have a 1990 ford ranger 4x4 with a 4.0 .its hard to start when cold. its starts fine after that and runs fine after you get it to start. thank.
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The problem could be plugged up catalytic convert it is related to tune up.One more thing fuel filter too. Check auto zone if they have anything to burn out catalytic.When you change with standard catalytic you will have code PO420 will be a headache!!!!!!!! 80% cars have this problem Think twice before doing anything.
surge, lopes, hunts, all same. but does it do this hot/cold or both engine temps.?????????
Im and expert on this.... done many and is related to EFI fuel controls
big time..... (ive even programmed Megasquirts to do this)
first the rules then causes.
Rule 1, The EFI controls idle at all times. so that proves.
Macro reasons.
1: EFI lost control. (stuck ISC?)
2: Engine is missiing (too rich, too lean or never tuned up)
3: or both, usually #2 causes 1 ,
there are ways to solve this riddle
my ways are simple
i test the ISC, see if it works, (unplug it or power it with 12v power supply, ) Id clean the ISC first.
this old car 1992 , scan tools are hard to find for OBD1 cars.
so cant look to see if CLosed loop is working, I can with a scope
but you dont have a scope.
you could put in the diagnostic check jumper and hope for an error code to flash out.
you can look as spark plugs (newones work wonder) and see
if its burning fuel correctly (like old school carb days)
black?> white tips>
all engine carbs and EFI all will surge when lean,.
all, and on EFI it will in fact try to stop the surge,
if lean enough the EFI can actually make the surge worse
is it tries desperately to correct the impossible.@!
that be surge.
i learnd that loping my mule one day.. LOL
1988 ranger 2.9 runs great cold then after a few minutes when warmed up hesitates with intermittent black smoke from the tail pipe until i hit the the throttle then clears and will repeat this behavior...
Loping idle like this is most likely cause by an intake manifold or vacuum hose leak. Check your vacuum hoses for any cracks or disconnected hoses. If they are fine, then listen for air noise around your intake. A length of tubing can be helpful.
i have a 1990 ford ranger 4x4 with a 4.0 .its hard to start when cold. its starts fine after that and runs fine after you get it to start. thank.
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