355 won’t start.

Crank Ref sensor, ECU relay, injection relay and fuses. Start with these simple things. How are you verifying it has fuel Pressure?.

 

Did your gas cap ever give a sucking noise when removed.

 

Fuel or spark??
Borrow a timing light and check each spark plug is firing. If good then fuel checks

 

Or buy one of those spark testers on eBay for $10 and have someone crank the engine while you're testing the ignition leads.

The more we know about the car, the easier it will be for us to help you. What year is the car? Do you know if it is a 2.7 or 5.2 car? Are you in the USA? Do you have an owner's manual to tell you which fuses are which in the passenger footwell? Are there fuses for one fuel pump or two?

 

Assuming it's a 5.2...... Did you disarm the immobilizer ?

 

what would this relate to the car not starting, considering all else equal..

 

No suction, that means no fuel being pumped.

 

The presence of fuel pressure isn't going to put a vacuum on the tank.

 

What causes the vacuum in the tank typically?

 

Stuck tank vent valve. Should not be vacuum in the tank.

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Thanks, Mike. Did the engine make any attempt to fire up? (Did it splutter, or did it sound like it was dry cranking?)

A question for the 2.7 experts: Assuming it's not likely that both pumps will fail at the same time, will the car start with one good fuel pump? If it will, then we need to look elsewhere. Similarly, if one coil pack is faulty, will the car start? (and run roughly).

 

Strange. You would think that at least one bank would be functioning on a 2.7 car (unless there are multiple failures).

When you say the engine doesn't seem to be getting any fuel, does this include no evidence of raw fuel at the tailpipes? (vapour or liquid)

Anyway, continue your fuse and spark checks. Unfortunately, there are no fuses for the ignition coil packs to check. Power comes directly from the ignition key. When you said you had no immobilizer, does this include a previously installed aftermarket system but currently disabled? If there is no spark, perhaps we can check the voltage going to the coil packs (from the igntion key) . Do you know where your coil packs are? Pin 2 on the coil pack connector should have 12volts with the ignition key ON.

 

Check to make sure to all your ground wires are connected properly and in good condition.

 

As Ernie said check grounds. My 2.7 would not start and turned out was a bad ground to the back of the head.

 

Interesting. The 2.7 ignition system has separate earths/grounds for each bank. Everything on the 2.7 seems to be duplicated. Surely one bank would show signs of life?

How is the engine grounded to the chassis on a 355?

 

I did not get any spark on the bank with a bad ground. The engine would just crank and barely run. There are two grounds to the back of each head.

 

The ground cables run and connect to the cylinder head.


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Thanks, gents.

This adds to the mystery. Mike seems to be getting no signs of life from either bank. Why would two grounds suddenly go bad? Maybe one failed earlier, and there was still a signal path through the engine block. The second one may have failed more recently.

 

So all fuses and relays have been checked In the front footwell black box?

 

How often do the fuel senders fail on F355's? I see on the Technical forum that 360's have problems with these. The gauge shows ok, but there is no fuel in the tank.