Flat spot/stumble.
#1
Flat spot/stumble.
Hi i have a 1989 F150 6/300 thats developed a stumble just off idle as you accelorate from low idle,ie at intersection etc, im wondereing is anyones come across it before i start pulling things apart or replacing plugs leads etc it runs fine except for that.
cheers Baz.
cheers Baz.
#2
#6
1. I would check all ignition components and replace as needed.
2. Replace fuel filter if more than 2 years old.
3. Pull O2 sensor and check for contamination.
4. Check fuel pressure at FPR.
5. Check the ACT and ECT sensors, as they are fouled.
6. Clean throttle bodies.
7. Clean IAC and EGR valves.
James
2. Replace fuel filter if more than 2 years old.
3. Pull O2 sensor and check for contamination.
4. Check fuel pressure at FPR.
5. Check the ACT and ECT sensors, as they are fouled.
6. Clean throttle bodies.
7. Clean IAC and EGR valves.
James
#7
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#8
The ACT, ECT, MAP, O2 and TPS are all part of the Speed Density (non Mass Air Flow) system. Each sensor works together to regulate air, fuel, throttle position and so on.
I would look at a Haynes manual or pull up the parts at www.rockauto.com to see what the components look like. The ACT, ECT, MAP and TPS are underhood.
I would look at a Haynes manual or pull up the parts at www.rockauto.com to see what the components look like. The ACT, ECT, MAP and TPS are underhood.