1997 S250TXRV Bad idle

[Jnilgaihuntr]

I have a 1997 S250TXRV that has begun to idle roughly. The engine has about 500hrs on it. Compression runs between 119 to 115 on all cylinders. I have also noticed that once I shut it down and try to start it after 5 mins it cranks for awhile before it fires. It had never done this before. At initial startup after pumping the primer bulb it starts right up. I thought maybe I might be losing fuel pressure. The dealer thinks I need to replace all the fuel injectors at a cost of $1500. The rough idle continues to about 2000 rpm and then the engine feels as though it is missing for about the next 5 mins or so and then clears up at any throttle setting. Runs fine at higher speeds after the missing goes away. Return to idle and the problem with the miss starts again. There is no excessive smoke so I don't think it is loading up. At idle it sneezes which makes me think it might be low fuel pressure again. Any ideas?

 

[rodbolt]

Re: 1997 S250TXRV Bad idle

when was the last lift pump check?
the 3.1L motors are hard on them.
if you suspect injectors they are easy to pull and send to an injector shop for cleaning and testing. we use flagship marine in Florida.
have you tested the plug caps?
have you tested the fuel rail pressure while its running poorly?
use the diagnostic test lamp to inspect for any active trouble codes to aid in not chasing ghosts.

 

[Jnilgaihuntr]

Re: 1997 S250TXRV Bad idle

Rodbolt, so far all I've done is tested the fuel rail pressure when it was idling but it was not running poorly at the time. Will try your suggestions and get back with you. Can you tell me more about the diagnostic test lamp or is it somewhere in the repair manual that I missed?