Why won't my 1991 Civiv 1.5L accelerate after reaching 50mph?

Question

It also slows down going uphill at high speeds. The compression is fine, but there is a ticking in the 4th cylinder of the head which looks to be in good shape.

Answer 1

have your on board computer checked for any code,s......get a good tune up........have your ignition timing checked......check your timing belt/gear,s/chain........sound,s like slow/retarded timing!

Answer 2

You could have cylinder failure, or it just needs a good cleaning. Or your air sensor is clogged so it won't allow the engine to accelerate too much because it thinks not enough air is getting into the engine.

Answer 3

Get a Haynes Repair Manual at the local Auto Zone or auto parts store in your area. It will troubleshoot and show you how to fix your vehicle. Also on the Auto Zone site has a section for vehicle maintenance
http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info

Looks to me like you need a tune up but check the above out. If you plan to keep the car another year, spend the $20 for the manual. This is what one section of the URL above said on losing engine power. Now you can see why you can look it up yourself. Too many things to look at.

Priority Action Part Type Cause
1 Inspect Air Filter Restricted or clogged air filter.

2 Inspect Fuel Filter Clogged or dirty fuel filter

3 Inspect Distributor Worn, loose or incorrectly adjusted distributor.

4 Inspect Distributor Cap Loose or cracked distributor cap

5 Inspect Distributor Cap And Rotor Kit Loose, cracked, or worn distributor cap and ignition rotor.

6 Inspect Spark Plug Fouled, damaged or broken spark plug(s).

7 Inspect Wireset Damaged, worn, or deteriorating spark plug or coil wire(s).

8 Inspect Throttle Position Sensor Faulty throttle position sensor or throttle position sensor circuit.

9 Inspect Catalytic Converter Clogged, damaged, defective or faulty catalytic converter.

10 Inspect Air Cleaner Temperature Sensor Damaged or faulty air cleaner temperature sensor or air cleaner temperature sensor circuit.

11 Inspect Coil - Ignition Damaged or faulty ignition coil or ignition coil circuit.

12 Inspect EGR Valve Clogged, dirty or improperly functioning or defective egr valve.

15 Inspect Mass Air Flow Sensor Improperly connected or faulty mass air flow sensor.

16 Inspect MAP Sensor Improperly connected or faulty m.a.p. sensor.

17 Inspect Knock Sensor Improperly connected or faulty knock sensor.

18 Inspect Timing Specification Incorrectly adjusted engine timing.

19 Inspect Piston Ring Set Worn or broken piston rings.

20 Inspect Fuel System Pressure Incorrect fuel pressure being delivered to carburetor or fuel injection system.

21 Inspect Fuel Pump Improperly functioning fuel pump or circuits.

22 Inspect Fuel Injector Pressure Regulator Faulty fuel injector pressure regulator or circuit.

23 Inspect Fuel Injector Plugged, dirty or poorly connected fuel injector.

Answer 4

maybe your to Heavy