Have been researching this issue because my '85 LTD has a fuel smell on start up and while riding. Have replaced the TPS with an aftermarket TPS, still no joy.
Have looked at the plugs and see that one bank specifically #1 cylinder is wet after sitting for the night. To me this indicates that I have a leaking injector, but I don't think it contributes to a fuel smell once the engine is started. I do think this contributes to the engine not operating as smooth as it should, it's not bad, but not as per new - I know it is a 34 year old engine.
The injectors for the '85 LTD FI system are apparently rated at 280 CC/min - approximately 26 Lbs/hr. Have found a comparable injector, P/N 195500-1070 listed on: https://www.witchhunter.com/ The issue with this is that I cannot find an auto that uses this size of low impedance injector. The closest I can come to this is 195500-0456, 220 cc/min, used in a 1988 Mercury Tracer, or a similar year Mazda 323.
I have perused various web sites regarding fuel injector requirements, and it would seem that the 280 cc/min injectors are oversize for the 1200 considering a lower flow rate is used on the Tracer and 323 1.6 litre engines. The flow rate that I get using the various web sites and considering an 85% performance rating is approximately 19 lbs/hr - 200 cc/min. Considering getting new injectors for the old girl. Set of four from Rockauto are approximately $85.00 CDN plus shipping.
I have looked into the fuel pressure regulator (FPR). It is a component in the system that could contribute to this fuel smell. Found a web site that lists five issues that are a result of a faulty FPR: https://procarmechanics.com/5-signs-of- ... regulator/
Not all of these symptoms need be present, and the FPR may function, not be leaking, but have a weak spring acting on the FPR diaphragm. I connected a fuel pressure gauge to the manifold and went for a ride. Noticed a 5 lb swing in the fuel pressure between acceleration and deceleration - 35 to 40 psi. May be an indicator. Still learning about this.
The closest FPR I have found that is configured and should fit is the Tomco 21004 FPR rated at 39 psi. This should be acceptable considering the injectors are tested at 3 bar (approximately 43 psi). These are approximately $115.00 plus $26.00 shipping CDN.
More to follow.
Cheers
Have looked at the plugs and see that one bank specifically #1 cylinder is wet after sitting for the night. To me this indicates that I have a leaking injector, but I don't think it contributes to a fuel smell once the engine is started. I do think this contributes to the engine not operating as smooth as it should, it's not bad, but not as per new - I know it is a 34 year old engine.
The injectors for the '85 LTD FI system are apparently rated at 280 CC/min - approximately 26 Lbs/hr. Have found a comparable injector, P/N 195500-1070 listed on: https://www.witchhunter.com/ The issue with this is that I cannot find an auto that uses this size of low impedance injector. The closest I can come to this is 195500-0456, 220 cc/min, used in a 1988 Mercury Tracer, or a similar year Mazda 323.
I have perused various web sites regarding fuel injector requirements, and it would seem that the 280 cc/min injectors are oversize for the 1200 considering a lower flow rate is used on the Tracer and 323 1.6 litre engines. The flow rate that I get using the various web sites and considering an 85% performance rating is approximately 19 lbs/hr - 200 cc/min. Considering getting new injectors for the old girl. Set of four from Rockauto are approximately $85.00 CDN plus shipping.
I have looked into the fuel pressure regulator (FPR). It is a component in the system that could contribute to this fuel smell. Found a web site that lists five issues that are a result of a faulty FPR: https://procarmechanics.com/5-signs-of- ... regulator/
Not all of these symptoms need be present, and the FPR may function, not be leaking, but have a weak spring acting on the FPR diaphragm. I connected a fuel pressure gauge to the manifold and went for a ride. Noticed a 5 lb swing in the fuel pressure between acceleration and deceleration - 35 to 40 psi. May be an indicator. Still learning about this.
The closest FPR I have found that is configured and should fit is the Tomco 21004 FPR rated at 39 psi. This should be acceptable considering the injectors are tested at 3 bar (approximately 43 psi). These are approximately $115.00 plus $26.00 shipping CDN.
More to follow.
Cheers