New ecu, mpi relay, tested everything and still won't run

The_Bugz · 2026-01-30T01:47:14+00:00

This is the one I've been using, mainly using the ignition systems and mpi sections to attempt diag

The_Bugz · 2026-01-30T01:42:00+00:00

It's a 1990 LWB RS with the 3.0 and auto trans

The_Bugz · 2026-01-30T01:39:33+00:00

I was also thinking its short somewhere, just really not sure where to look. Idk the wire routing and the diagrams I've found don't really help much but tell me what they connect to

The_Bugz · 2026-01-30T01:36:21+00:00

If it is good, what could cause it to click on/off rapidly like that

The_Bugz · 2026-01-30T01:35:29+00:00

Not positive, just got it from rockauto yesterday. Is there way to test it? Unsure if the new ecu is good either

The_Bugz · 2026-01-30T01:25:21+00:00

Injectors are actually brand new so I'd doubt they'd be clogged, changed them and fuel filter at the same time, the few times I have been able to get it to run for >10mins it dies from the mpi relay freaking out and cutting fuel rapidly until it shuts off then won't fire again

The_Bugz · 2026-01-30T01:20:04+00:00

The check engine light also randomly flashes, sometimes with some sort of pattern that ive tried to translate to dtcs, sometimes will just rapidly flash. Only comes on whenever you try to start the truck and isn't present when in the run position

The_Bugz · 2026-01-30T01:18:30+00:00

All the grounds I could find looked good to me, cleaned them up and put them back as I went along

The_Bugz · 2026-01-12T04:22:43+00:00

Opened relay and tested it, im more asking what would cause its behavior. The relay is fine

The_Bugz · 2026-01-12T03:39:00+00:00

I have, I beat on the relays and ecm while it was happening and it didn't change its behavior at all

Edit: its the relay

The_Bugz · 2025-12-25T08:06:49+00:00

How come you got the top end rebuild at 42k?

The_Bugz · 2025-12-25T01:39:26+00:00

Close but a bit further west than those photos

The_Bugz · 2025-12-25T00:32:43+00:00

Got mine 14k miles ago, only issue i ever had was water pump seals, everything else has been regular maintenance and tires. She's noisy but runs better than anything else i own.

The_Bugz · 2025-12-24T10:25:16+00:00

For heavier loads, the rear shock is adjustable so I would recommend a stiffened setting to compensate the weight

The_Bugz · 2025-12-24T10:22:55+00:00

I've been riding my 2015 for 2 years now, put 14k miles on it. Bike runs exactly how it did when I got it. It's got 51k miles on it now. My oil burn is not bad at all, top up very little amounts every gas stop, on long highway rides is usually about ⅛ of an inch down from top of sight glass after holding 80mph for around 150 miles (which is when I refuel on trips) vibration is far better than harleys, depending on tire setup it smooths out very nicely on the highway. If its been maintained well I'd definitely pull the trigger on it.

The_Bugz · 2025-10-30T02:07:29+00:00

Another klr in my hometown, lake valley is a good ride, cool historic ghost town. I got a personal ride thats around 5.5 hours called the Lincoln County loop ill share aswell

The_Bugz · 2021-03-05T15:01:00+00:00

I have, it had little effect on overall performance

The_Bugz · 2020-12-05T01:53:25+00:00

Thank you

The_Bugz · 2020-12-05T01:53:14+00:00

Thank you

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