3/1/2024 0 Comments Evap system monitorThe service manager then changed his tune and said that the tech's diagnosis was a "worn but not yet broken" valve spring. ![]() They might have gotten me too if I didn't have my wife drive up in #2 (an almost identical 1999 5.4) with exactly the same symptoms but without any noticeable valve noise. I know what a broken valve spring sounds like and mine does not sound like a typical broken valve spring. They insisted that it was a broken valve spring. Last week, my wife made me take #1 to the Ford dealer. But I haven't noticed any particular pattern at all. There were a few times, I thought I smelled a bit more fuel than normal when I've had the hood open. My gut tells me that this is a leak somewhere along the evap route and also that this is a typical problem that happens after 25 years of plastic drying out. During that hopeful time period the 2 trip cycles for evap and catalyst still wouldn't clear. The engine light didn't come for about 600 miles. You may assume that the manifold replacement was done correctly and that all the cylinders were protected and that the correct torque sequence and torque stages were followed. Since I was in the general vicinity, I checked the block sensor and the coolant tube. ![]() I vacuumed out a lot of dry crumbly rust. It was dry underneath the manifold (except for small amount of coolant released during teardown) I did see some evidence of an earlier coolant leak or spill underneath the intake manifold. I bought several intake manifolds on closeout for 100 bucks about 10+ years ago. I installed a Ford replacement intake manifold. No vacuum leaks.Įarly last Spring I decided to change the intake manifold. followed to the evap connector hose located underneath the frame near the front driver's side tire. coolant leaks- verified by driving several hundred miles with a white cotton towel covering cylinder 4 area and the underside of coolant quick connectors. spark plugs-coils-injectors- all checked, rotated and triple-checked. ![]() If I turn off the overdrive the shaking stops at the point that the engine is running an additional 500 rpms faster. But out on open road, going uphill there is a chopiness and slight shaking. Road situation: In town there is no difference at all in driving quality. Expy #2 doesn't have any valve noise at all. #1 also has a very small amount of valve clatter like you might hear in an 8-cylinder with 250,000 miles. For no other reason than that I've been working only that one. The other clue is that the trip cycles won't complete for the catalyst monitor and the evap system monitor.Įxpy #1 is the one that I've had the longest. They both have the exact same problem: 304 code (cylinder 4 misfire). One I've had for over 20 years and the second one for about 5 years.
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