A few issues on my first 100-miler

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ShagWagon
Posts: 702
Joined: Tue Apr 19, 2016 8:13 pm

Re: A few issues on my first 100-miler

Post by ShagWagon »

Maybe your engine is just running hot.

I had an overheating problem once caused by too long of spark plugs installed. Would slowly heat up, then cool right off as soon as I pulled over and lowered the rpm. The auto parts store sold me the wrong plugs. When I pulled them 3 were disintegrated.

Maybe the kink in the vent line is preventing the tank from venting the return gas from the efi. You could put a metal or pvc coupling over the hose through that area.
87 Grand Wagoneer Rebuilt 360 by S&J, Fitech GO EFI 600, Novak in-tank fuel pump, Skyjacker Hydro 4" lift, BFG AT KO2 30", Dynamax Muffler, MSD distributor, MSD ignition, Edlebrock perf 4bbl intake, Elgin perf cam, Oil tube mod, Roller rockers, chrome molly lifters, HD alum radiator, Powermaster 150/100 alt, Alum HD water pump, Serhills tailgate harness, Cowl screen mod, Evil Twin grab handles, Rstep's custom AMC door lock knobs, all electrical works.

letank
Posts: 4009
Joined: Wed Oct 03, 2012 9:16 pm
Location: SF bay area

Re: A few issues on my first 100-miler

Post by letank »

merrill77 wrote:There doesn't seem to be a consensus that reverting to the mechanical fan and shroud is a better solution than an effective electric fan.

Because I already have aftermarket radiator with fans & shroud, it is assured that reverting to mechanical would be a lot more work than buying a higher CFM fan that matches my existing setup. I bypassed the ammeter about a month ago - the charging system is healthy, based on my monitoring over the past month. From what I can see, the fans are already wired direct (with relays & fuses)...not through the fusebox.

So I'm going to try a fan upgrade to see where that gets me.
Good job on the Efan wiring, but if it is slowly creeping at hwy side, it can be a few things, basically the engine is generating more heat than the radiator can exchange,

1- first are you sure about your gauge accuracy
2- overadvanced timing in cruise mode
3- overly lean at cruise
4- partially opened EGR-looked at your picts, NO EGR-

1- did you check w infrared thermometer the accuracy of the gauge
2- you need to measure your timing at rpm, engine in park, brakes set, and I recommend placing the bumper against a utility pole, our rigs can be fussy and it would devastating to be run over by one's rig. use the timing gear w and wo the distributor vaccumm connected, but I believe that for EFI, the distributor advance is blocked is set by the CPU of the EFI, but at least you can measure the variations 1, 1500, 2000, 2500 and 3000 rpm
3- overly lean, you have an oxygen sensor and there is a way to monitor the output of the sensor , if you have the right sensor, voltage can be measure
4- if you have an EGR, but the EFI should compensate

of course we expect that your engine is in good mechanical conditions, a bent pushrod could create issues -from experience- lfound your original post, at 112Kmiles it should run like new, with plenty of power, it is a 401
Michel
74 wag (349 Kmiles... parked, next step is a rust free body)
85 Gwag (229 Kmiles... the running test lab)
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merrill77
Posts: 215
Joined: Fri Jul 14, 2017 6:25 am
Location: Raleigh, NC

Re: A few issues on my first 100-miler

Post by merrill77 »

I did 100 miles yesterday on the freeway, full sun and 90F+ temps, A/C blasting the entire way. No oil-pressure drop and while the temp was a little higher than around-town driving under similar conditions, it was steady.

I didn't make any cooling changes, but a higher-capacity fan is on my to-do list.

Yay!
77 Wagoneer and 97 TJ.
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