2005 Expy Multiple Misfires & P2198

[ShowMeChiefs]

Hi All,
I got my 2005 Expy 5.4 back from mechanics shop in July and it was running great. I had the intake manifold, injectors, & spark plugs replaced. I have only put a few hundred miles on it & last week CEL came on, but went back off. Within 40 miles of driving it this week, it now has P2198, P0300, P0301, P304 & P308.
I looked & listened for vacuum leaks to no avail... cleaned MAF, replaced fuel pressure regulator w/ a used one I had on hand...checked wiring to O2 sensor...I definitely smell gas.
I’m no mechanic & my mechanic is gone until next week... any ideas/advice, Plz & Thx!!

 

[Hamfisted]

How many miles on it ? When was the timing chains and phasers replaced ?

 

[ShowMeChiefs]

Thanks for reply!
It has 220k... had phasers,vct’s & timing chain done at 180k... my mechanic text me & said if I wanted to try something to unhook both upstream O2 sensors & run it for a lil bit & see if it that helps... that sound feasible?

 

[Hamfisted]

Thanks for reply!
It has 220k... had phasers,vct’s & timing chain done at 180k... my mechanic text me & said if I wanted to try something to unhook both upstream O2 sensors & run it for a lil bit & see if it that helps... that sound feasible?

No. The P2198 code is the forward oxygen sensors sensing a rich fuel mixture, which is the gas you smell. If your mechanic had a smoke test machine that would help. The smoke would show you any vacuum leaks, even if you can't hear them. But for whatever reason the computer is dumping a ton of fuel into the motor. Your best bet is probably to wait and let your mechanic examine it when he gets back in town.

Smoke Test Machine on Amazon






.

 

[ShowMeChiefs]

Gotcha... I’m babysitting my 16 month old Grandson,atm, so I wasn’t gonna be able to try it until tomorrow. He does have a smoke machine That’s how he found the intake manifold leak... guess I’ll wait & let him look at it next week... sold my back up vehicle & didn’t want to be w/o wheels this weekend, lol
Thanks for your help!!