Runs Perfectly - HARD to start - 93 RRC 4.2

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Apr 26, 2024 | 09:20 AM

11111steve

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2nd Gear

Joined: Apr 2024

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Runs Perfectly - HARD to start - 93 RRC 4.2

Hello, I have been troubleshooting a hard start issue and could use some assistance.

Engine runs smooth and strong at idle and under load. No strong exhaust smells.
very hard to start... takes 4-5 attempts with various number of cranks. Usually between 5-10 seconds to get it to fire up. doesn't matter if its hot or cold.

ignition amp 1 year old. connectors and grounds look ok
cap looks fine
new rotor
wires one year old
battery voltage tested fine but not tested for cranking amps.
battery grounds cleaned
battery hot lead may show a little age
oil level ok
i can hear fuel pump priming when in AC mode, and relay click every time
coil 1 year old Lucas brand i believe. connectors clean and tight
starter seems to sound strong
when in ac mode attempting to let the fuel pump run for a few seconds to get it to fire up... mixed results
one of the injector connectors was so worn the wire casing cracked off... MAY have shorted on injector 1... repaired... I will test for voltage at this injector
squeezed the vacuum line to the fuel pressure regulator in attempt to keep some fuel in the rail and re-start. no change.

thought initially the fuel pump or fuel pressure regulator, but again, the car runs fine when i finally get the engine to fire up.
I have also heard that the fuel temp sensor may be a culprit. I unplugged it and attempted a start up. no change when its plugged in or not.
My next step to look at the connections to the starter. but again it sounds strong.

I have read through several forums here, but many have similar issues AND rough idle/ stalling or these symptoms only when hot or cold.

thanks in advance for the input. ill check back.

thanks,

Steve