V8 5.2 in Laredo but...ECU is not working

Lex-Lutor · 2006-01-07T23:29:43+00:00

I hope to find some help here about my problem. We made a real monster fromone Laredo (1985 year). After many working hours 5.2L V8 engine from GC(year 1996) is now fit inside this Jeep. After we start engine it runs 8-10seconds and than goes Off. (fuel pump, map, temp, and all other enginesensors are connected OK), since we use only engine CPU I'm pretty much surethat engine CPU send stop signal to fuel injectors because there is nosignal form board computer, (CPU unit inside Grand Cherokee cabin) Is thereany solution to make fake signal or emulate board computer ???We need original CPU since electronic unit from automatic transmission willnot work without engine CPU.For final solution we can connect board cpu, but it will be too much wiresand hard to find safety place inside !Thanks for any help.PS: Just for info, is there any code or other protection inside engine cpu,is there any problem to exchange engine cpu between same models ??

Jan 07, 2006 20 Replies

Rate this thread:

bllsht 20 years ago

The oil pressure switch is open with "no" oil pressure and closed "with" oil pressure. It is not a temp sensor. With the engine running, there is always power to the choke heater.

There is a temp sensor that operates the manifold heater relay.

Vote