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Jim Chill
Jim Chill, Technician
Category: Car
Satisfied Customers: 590
Experience:  15 years Ford dealership experiance 25 years all makes and models
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91 miata: bogs down..runs well..problems after warming

Resolved Question:

I've a 91 miata, and it bogs down when I give it gas. It runs well when cold, but starts to have problems after warming.
Submitted: 7 years ago.
Category: Car
Expert:  Jim Chill replied 7 years ago.

Is there a check engine lite on? i am thinking a coolant temp sensor is reading wrong starving it for fuel.

Customer: replied 7 years ago.

No check engine light is on.


Expert:  Jim Chill replied 7 years ago.
Expert:  Jim Chill replied 7 years ago.

Verify air intake system is unrestricted.
Check EGR valve and solenoid for correct operation (if equipped).
Check No. 1 and No. 2 purge control valve operation.
Check vacuum switching valve operation.
Check coil resistance.
Check airflow meter for cracks.
Check airflow operation and resistance value.
Check atmospheric pressure sensor.
Check secondary air injection system (RX7).
Check Variable Dynamic Intake System (VDIS RX7).
Check Variable Resonance Induction System (VRIS) for correct operation (MPV 3.0L, 929 SOHC and DOHC).
Check Variable Inertia Charge System (VICS) for correct operation (Protege 1.8L DOHC).
Verify connector at crank angle sensor has correct resistance values.
Check A/C cut-off system (if equipped).
Check Triple Induction Control System (TICS) for correct operation (929 SOHC).
Ensure fuel system pressure is correct. Use ohmmeter to verify fuel injector terminal resistance.


here are a few checks listed under poor acceleration listed in my michell manual. thank you jim

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