insane 7mge

[joemccaleb]

someone help. after 20yrs of 88 targa top fun it cut a light pole down!! broke my heart. now i toof my 7mge and put in an 89 body. something aint right. WONT IDLE TIMING WAY ADVANCED. DO i need to use the distrubutor from the 88? that and injectors were all that wouldnt plug and play. I have invested a ton of time and several bucks trying to get me a REAL car to drive again. open for suggestions PLEASE

[professorbob]

Did you check regarding the 1989 as to whether was a turbo. Did you install a 1988 Computer?
Has the harness been splice anywhere?

[professorbob]

Did you check regarding the 1989 as to whether was a turbo. Did you install a 1988 Computer?
Has the harness been splice anywhere? Regarding idle. is it slow, fast, skipping hard to keep running.

[joemccaleb]

Replaced engine control module. Only 2 items wouldn't plug and play. Distributor and fuel injeCtors were used from the 89 engine is an 88 both na

[joemccaleb]

As far as idle its really low and rough staggering around 500rpm

[joemccaleb]

This one has me baffled I've been playing supra for 20yrs. Set base timing, checked all plug wires. No vacuum leaks. Most recently when I started it and coaxed it to run just to operating temp, the exhaust manifold turned chery red!! Cat stopped up? Never has had that condition. Surely their isn't a difference in distributor from 88 to 89?? Or injectors??

[btwilson86]

Injectors may be different, there was a change at some point between low and high impedance, although i cant remember the details. Exhaust cherry red sounds to me like you have retarded ignition timing. Just to be clear, you verified your cam timing is spot on, then brought the engine to operating temp, and then set your ignition timing to 10 BTDC with the jumper wire in place?

Also, why did you swap any electronics? Did the 89 not come with an intact engine control system?

[joemccaleb]

timing is retarted. distrubutor and injectors have different plugs from 89 to 88. reason for change. diagnostic port shows codes 24 and 51 intake air temp and a/c. timing seems to be advancing or retarted wit the jumper in place.

[btwilson86]

Originally Posted by joemccaleb

timing is retarted. distrubutor and injectors have different plugs from 89 to 88. reason for change. diagnostic port shows codes 24 and 51 intake air temp and a/c. timing seems to be advancing or retarted wit the jumper in place.

Well, if I remember correctly, you can't properly set your ignition timing with DTC's present. You will need to fix your CEL codes before proceeding any further, as your base ignition timing will not be set properly until you do.

When setting base ignition timing, it can't advance or retard- it is whatever you set it. When you remove the jumper from the diagnostic box, it should stay close to the base timing of 10? BTDC, but it may retard or advance by a degree or so.


89 is a very tricky year as far as engine / chassis wiring is concerned; there are several variations, and they aren't necessarily 100% compatible with earlier or later set ups. Your '88 should have used yellow fuel injectors; since you said that these injectors didn't plug in, I'm assuming you have green fuel injectors installed? The yellow top injectors are low impedance, green top are high impedance. Low impedance injectors require a resistor pack to function properly (your '88 had one, your '89 probably doesn't), high impedance do not.

Also worth noting, yellow top injectors flow 295cc, green injectors flow 315cc


So that I (and anyone else reading this) understand your swap correctly, you have an '88 7MGE with an '89 distributor, '89 fuel injectors, '89 wiring harness, '89 ECU, and all the '89 electronics on the fenders (ignition coil, AFM, etc)?

[joemccaleb]

Awesome. So where is the resistor pack located? I have finally fixed code 24 by replacing the mass air flow sensor. Code 51 still present. You are correct 89 body and harness injectors and distributor 88 engine. I never dreamed this swap would be this tricky!! Your insight is greatly appreciated. I need my supra