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The ECU I ordered from Flagship One left me in the same situation as you John. Sent it back. You are better ordering with @Wranglerfix. It was a more expensive unit but it arrived quickly and he's a pleasure to deal with. Got my 98 TJ going again and I even might have a few more horses to boot...

Ken, I concur with Charles. I got my TJ going again and the old unit had been removed for a month or two before new one arrived. Remove immobiliser and skim before installing new ECU. I'm in Ireland also ken so if you need assistance just ask.

Don't have a reader handy. Should be able to get access to one tomorrow or day after.

Yep did that, ran for a second, which was great to hear. If it was the immobiliser it should run then cut out yes? So thinking crankshaft sensor or fuel pump possibly.

Thanks bigeef, I got it from @Wranglerfix, who has sorted lots of people that had ECU problems so I've no concerns about the unit. I took a look at it there and it's almost starting, I get hear the fuel pump going but no fuel is getting to the fuel line. So that couldn't be the immobiliser? Must...

Haha, in that case maybe I'll send it over with McGregor's signature, although he just gets his ass kicked these days, a bit like my jeep. Let me try to get in touch with may scofield first, see if they have any advice on getting around their system.

Hi Pat, I'm having the same issue with a TJ 4.0. Ordered new ECU from states, removed ms and skim but still not going. Manufactured end of 97. Right hand drive, just have two grey keys. Any help appreciated.

Cheers Sam, yes it runs fine from the starter. Just can't figure this out. Hopefully Del from may scofield gets back with a simple solution.

Thanks Mark, stating to think that it could be the may scofield immobiliser. Guy called @Sam recently had similar problem https://wranglertjforum.com/threads/97-tj-immobilizer-problem-solved.46623/ but he mentions the car will be dead if you remove immobiliser before new unit arrives? Thinking...

Hi all, could really use some help here. Have a jeep TJ 4.0, manufactured Dec 97 UK spec, has two grey keys, no fob. Was just starting jeep to leave Tesco in September, it started and died, key light remained on. Got it towed to auto spark who said ECU had gone bad. Ordered new ECU from flagship...

Thanks for posting by the way, very helpful. Just worried I've killed the jeep by removing unit before new one arrived? Is this recoverable? The key light has at least gone out with the new unit. Both immobilisers reinstalled but jeep still seems immobilised.

Hi Sam, I'm having the same issue with a 97 TJ. Ordered unit from flagship one but didn't remove skim first so returned it. Then I got a rebuilt unit from wranglerfix, removed both may Scofield and skim but still not going. So immobiliser was removed before latest unit arrived. Any advice...

Another vote for white out, had 31 bfgs in white lettering, down sized for fuel efficiency but kept the white lettering with a set of gripmax all terrain, very pleased. Just need my damned ECU working then I'll be back on the road!! Good luck whatever you choose.