Idles great, but stumbles when driving
- Thread starter Stang9050
- Start date
gkomo
now i can hopefully expect to receive the shaft
The ECT or ACT would trip a code. Have you checked the MAF for debris on the element? Have you done a tune up on the car recently (plugs, cap, rotor, plug wires, and fuel filter)? If not it may be a good idea to look these items over and do one. You say it is slow to crank, have you check the battery and the voltage at the battery when the car is running?
Bad ECT/act and it likely would not restart when hot due to flooding out.
Does it stumble in tip in? How new are your o2 sensors? Are you sure you are firing on all 8 cylinders? All primaries hot?
I’m suspecting a fueling issue (lean). I’d check for a misfire. At the end of theOBD1 code reading process, you can blip the throttle and start the cylinder balance test. It’s a crude way to test all 8 cylinders to see if the injectors are firing and the spark is igniting.
Wouldn’t hurt to test fuel pressure either to make sure you aren’t going lean when you roll on the gas
Does it stumble in tip in? How new are your o2 sensors? Are you sure you are firing on all 8 cylinders? All primaries hot?
I’m suspecting a fueling issue (lean). I’d check for a misfire. At the end of theOBD1 code reading process, you can blip the throttle and start the cylinder balance test. It’s a crude way to test all 8 cylinders to see if the injectors are firing and the spark is igniting.
Wouldn’t hurt to test fuel pressure either to make sure you aren’t going lean when you roll on the gas
+1 to checking fuel press and 'tip in' stumbling makes the TPS a suspect (even if it is new). Disconnect, clean, and re-connect the TPS. Don't concern yourself with [Key On] voltage.
Also: Idle up to operating temp (at night) and check for arcing under the hood and around the coil.
Also: Idle up to operating temp (at night) and check for arcing under the hood and around the coil.
The ten pin connectors, I assume that is the salt and pepper shakers. Mine had a factory recall shortly after I bought the car, now it two sets with the second one spliced into it. What lube do you recommend.
I like the lube that gets warm, wait you mean for the ten pin connectors.
Easy this is my area of expertise or at least my stupid CT says so.
Remove the second set of connectors and toss them. Depin the original ten pins and close the female pins a bit and expand the male pins. Now they will connect better. Dielectric grease is your friend. I did this to the ones on my 93 and still have Ford’s fix in a drawer in the garage.
Remove the second set of connectors and toss them. Depin the original ten pins and close the female pins a bit and expand the male pins. Now they will connect better. Dielectric grease is your friend. I did this to the ones on my 93 and still have Ford’s fix in a drawer in the garage.
Agreed Aero, Ford's bandaids suck. Heck I tossed my quad shocks as soon as I got my upper and lower rear control arms upgraded and have never had wheel hop again.
So, here I am again. Cleaned and lubed 10 pin connectors, changed fuel filter. I put new spark plugs in and discovered only plugs 4 & 8 are normal all of the rest shows very lean condition. I went to AutoZone for the loan a tool program and got the fuel pressure test kit. I hooked it up and didn't get any pressure readings even when I started the engine. Car runs well until it starts to warm up, then it jerks, bucks and stumbles. I don't understand the zero reading,, it's a new pressure tester.
Thanks for all the help.
Thanks for all the help.
You must not have hooked up right. Car wouldn't start if you had 0 fuel pressure.
Some testers out there have trouble depressing the schrader on the fuel rail. That’s likely what’s happening here. Make sure the tester you are using has the feature on the end to press down the little nipple inside
That was my thought, but when I took the gauge off there was fuel. The kit requires using adapters (included) to attach to the shrader valve and I used a wrench to tighten it before attaching the gauge to the adapter. I even come in the house to watch YouTube to make sure I doing it right.
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