daibhidh

We have a 2001 Civic that has us baffled. It starts perfectly once! If I turn it off it will not restart unless I let it sit for an hour or so. This happens when the engine is hot or cold. All the suspect parts have been changed or swapped with known good parts. This includes fuel pump, filter, fuel pressure regulator, distributor, fuel rail etc.
While checking fuel line pressure (it was perfect) I noticed that if I relieve the fuel pressure, the car starts right away. turn it off and it refuses to start until I relieve the fuel pressure in the rail. Injectors test good.
Starter is working perfectly, new battery and good spark.
It seems to have something to do that fuel line pressure.
CEL is not on and no codes stored.
Any ideas?

Poopies

iTrader: (4)

The car runs fine otherwise?

ezone

Scan datalist: ECT and IAT on a stone cold engine. Do they agree (within a couple degrees)? Is one out of calibration?

daibhidh

Other than the restart problem, the engine runs perfectly.
If there was a problem with the ECT or IAT,then relieving fuel line pressure should have no effect on starting right?
I am thinking it could be something in the EVAP system, but why no CEL?

mikey1

sounds like an electrical problem, most likely grounding,

disconnect the battery terminals, clean the posts and connectors spotless with a mixture of baking soda and water, use a wire brush if nessessary, let everything dry and wipe them off good before you reconnect,

check all other main connections, battery to engine/frame, ground from engine to frame, etc etc, make sure all are tight and corrosion/rust free, replace parts and wires as nessessary,

daibhidh

Problem solved! New ECT defective, another new ECT and all is good.
Thanks all.

ezone

People wonder why I post some of the answers I post.

bsmiley

What's an ECT?
I searched my repair manual but it returns every word with the ECT combo in it. Detect, connect, inspect...

ezone

OBD2 standardized acronym for Engine Coolant Temperature sensor.