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1995 Ford E350 RV 460 Pre-detonation Problem
The truck has 15000 miles on it and has been thru 3 engines due to
pre-detonation. Timing is correct but jumps around a bit, have verified chain to be OK. has new distributer and pickup, ICM checks OK, Ive been thru idle air , map & 02 sensors , any ideas what else could cause this condition besides fuel quality??? |
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1995 Ford E350 RV 460 Pre-detonation Problem
lugnut wrote: > On 28 Jun 2006 18:30:23 -0700, "dabworth" > > wrote: > > >The truck has 15000 miles on it and has been thru 3 engines due to > >pre-detonation. Timing is correct but jumps around a bit, have verified > >chain to be OK. has new distributer and pickup, ICM checks OK, Ive been > >thru idle air , map & 02 sensors , any ideas what else could cause this > >condition besides fuel quality??? > > > Are you setting the timing with the SPOUT connector pulled > as it should be? The observation that the timing is jumping > around a bit is typical of setting the timing with the SPOUT > connector installed. You may want to thoroughly clean the > MAF sensor if it has one to make sure it is reading the air > intake correctly. I don't recall immediately whether the > '95 460 was MAF or speed density but, I believe it was MAF > controlled. There are instructions with photos in various > places on the web. You may want to make sure you have the > correct brand and heat range spark plugs installed. Many > times, a plug of a different brand with the same heat range > rating may actually operate in a different heat range than > the same heat range designation of the recommended brand. > Have you checked to make sure the engine is not running a > bit on the feverish side. An increase of only 10 deg F or > so above the recommended operating temp can easily cause > this. An incorrect EGR flow will also cause this. You may > want to replace the EGR control sensor. I don't know if > yours has an EVP sensor or a DPF sensor. They do not > always set a code. Also, pay close attention to the routing > of the spark plug wires. Incorrect routing can sometimes > result in crossfire under load. It is possible that a > crossfire to another cylinder just stating the compression > stroke can be the same a super advanced timing causing > extreme pressures in the affected cylinders. The factory > shop manual and some others will show a specific way in > which the wires are to laid out and installed. This can be > a PITA but, may be well worthy the effort. There have been > TSB's to this effect over the years related to some Ford > engines. Don't specifically recall that being the case with > the 460. > > Good Luck > Lugnut ----------------------------------------------------------------------------------------------------- I dont know who you guys (or girls) are, but i just learned alot from reading these two paragraphs. Some of what "lugnut" said was a bit over my head, and my experince in Fords is little to none. But i just wanted to say that i feel alright because i learned something...so...thanks! |
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