California Mfd (04-02) plane Jane 2WD was still getting 31mpg. The vehicle looks brand new, inside and out. Vehicle developed what in years past used to be known as an off idle stumble and then it just got worse from there. Idles and starts flawlessly. Accelerating from 1500-1800 the engine starts in with a bucking bronco ride, which occasionallys subsides. The tach does not fluctuate during all this and there are NO codes present. It was checked anyway, but nothing came up. CEL is working before start up.
I replaced the fuel filter, plugs and wires (it was time, anyway) along with cleaning the MAF sensor and replacing the TPS. Yesterday I noticed two small cracks emanating from two of the mounting screw holes on the underside of the coil pack. Replaced the pack but it didn't solve the problem. (I kept the coil pack since that was probably going to present a problem in the future.)
One mechanic insists it is the EGR valve, but, again, it idles and starts fine and no codes corroborate that. Oh, and he wants to R&R the transmission to get to the EGR valve. I've worked as a M/C mechanic, as a Saab and GM line mechanic, and was later certified on commercial marine diesels. This whole thing makes no sense.
So far, I've gotten a lot of advice from mechanics that have claimed to have an answer, but when it came out in the wash, really weren't familiar with this engine. I don't mind giving a "contribution", but at this point, I don't want to throw good money after bad. I tried this route with eBay and lost my shirt. Once burnt, twice shy, but I'd gladly contribute for a correct answer. Can that be done after the fact?
Question 1: Could it be an EGR valve issue? If not, what is going on here, and
Question 2: How the $%^#@ do you get at the EGR valve?
have the same problem?
Tuesday, October 11th, 2011 AT 11:35 PM