Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1989 Ford Tempo BaseFACTORY OEM SERVICE PROCEDURE
Symptom/Test Menu
DIAGNOSIS BY SYMPTOM (SYMPTOM-TO-CIRCUIT TEST MENU)
| Symptom | Go To: Circuit Test No. (Step No.) |
|---|---|
| Runs Rough, Misses, Stalls, Lacks Power, Rough Idle, Surges | D19 (2) |
| Stalls At Idle Or During Self-Test | D19 (1) |
| Stalls When Parking (OHC EFI only) | B15 (3) |
| Surges With A/C On At Idle (OHC EFI & HSC EFI only) | B7 (16) |
| A/C Stays On During WOT | D7 (11) |
| A/C Not Functioning | D7 (11) |
| A/C Compressor Always Runs (OHC EFI only) | D7 (1) |
| High Idle Speed After Restart. May Have Spark Knock For 3-5 Minutes After Restart (Turbo EFI only) | B7 (1) |
| Low Idle With A/C On | B13 (10) |
| High Idle In "Drive" A/T Trans Only | N/A |
| Shift Indicator Light Always/Never On (HSC EFI only) | D6 (1) |
| "CHECK ENGINE" Light Always On | D11 (1) |
| "CHECK ENGINE" Light Never On | D11 (2) |
| "CHECK ENGINE" Light On Intermittently | D11 (5) |
| "CHECK ENGINE" Light Flashes With Erratic Idle | D11 (6) |
| No Cruise Control And Stalls On Decel. | N/A |
| Stumble After Hot Restart | C1 (19) |
| Engine Will Not Restart | N/A |
| Fuel Pump Runs With Engine Off (OHC EFI & Turbo EFI only) | C2 (14) |
| Gasoline Fumes In Engine Compartment (Turbo EFI & HSC EFI only) | D4 (1) |
| Detonation/Spark Knock (OHC EFI) | B7 (1) |
| Detonation/Spark Knock (Turbo EFI) | B7 (2) |
| Engine Cooling Fan(s) Inoperative | N/A |
| Cooling Fan(s) Always On | N/A |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.