will not rev over 1800???????????????

[beemadaz23]

hi everyone, we have rebuilt the supra turbo, initially could not get it to start,
we have re-checked the timing and re done the cps unit, engine cranks slightly faster than it did before the rebuild, is running very rich(sooted up new plugs in less than 3 weeks) this is not being driven,just started up. takes a while to start but will only rev up to about 1800 then starts to cough splutter and backfire, has anyone got any other ideas as to what could be causing the car not to rev,

cheers in advance dazza

 

[7M-KDL]

coils?

 

[beemadaz23]

coils?

no problems with the coils, all sparking, it is overfueling heavily not sure if it could be something to do with vacuums or similar

 

[natedogr]

have you checked for codes? i had a similar problem with my rebuild. it turned out i had a bad TPS and it wasn't letting me rev past 2000rpm. or it could possibly be the afm. but i say definitely check for codes first.

 

[S.A. supra]

Did you mess with the tps? One time I didn't install the tps correctly and it did as you described. Idled perfect but wouldn't rev over 2000. it acted like it was hitting fuel cut.

 

[beemadaz23]

the only codes that have shown up came up with crank sensor??????? i am pretty sure it aint got one we looked all round and nothing down there. we have re-done the cps unit with the how to on here so pretty sure that is ok, we have just found one multiplug not connected next to the gearbox under the inlet, cant see anywhere it could plug into( were they're any plugs that went into an autobox as this is now manual)
as it is not throwing up any other fault codes it is getting really confusing

 

[beemadaz23]

Did you mess with the tps? One time I didn't install the tps correctly and it did as you described. Idled perfect but wouldn't rev over 2000. it acted like it was hitting fuel cut.

we have re done the sensor on exhaust side( i thought it was called cps????, is this the same thing or are we overlooking something, apologies if i sound like a novice) not to mechanically minded :1zhelp:

 

[natedogr]

the cps is on the exhaust side right behind the power steering resevior. the tps is on the throttle body. i would check to make sure that is adjusted right. and as for the "crank sensor" code you found there is no crank sensor. i'd check the codes again. what number code is it?

 

[S.A. supra]

we have re done the sensor on exhaust side( i thought it was called cps????, is this the same thing or are we overlooking something, apologies if i sound like a novice) not to mechanically minded :1zhelp:

Yeah thats the cps (cam positioning sensor) I am talking about the sensor that goes on the throttle body next to the iscv if you haven't messed with the tps Then thats not you problem. But if you have then you might want to reinstall it to make sure you catch the little valve in the throttle body.

 

[beemadaz23]

the cps is on the exhaust side right behind the power steering resevior. the tps is on the throttle body. i would check to make sure that is adjusted right. and as for the "crank sensor" code you found there is no crank sensor. i'd check the codes again. what number code is it?

cant remember the number that came up off the top of my head, we will get the guys round to plug it in again and i will get back to ya,
cheers dazza

 

[suprafanatic]

stupid question,, but is the afm pluged in? the car will run very rich, choke and die out if its not pluged in.

 

[JAYspec]

take a look at the TPS...had the same problem.

 

[kamikazemkiii]

did u wire the plugs up in the correct firing order?
i think that might be your problem, check that

 

[tbcmorris]

check, afm, then cps, then timing, then tps...thats what i would do in that order...look it up in the tsrm

 

[radiod]

check, afm, then cps, then timing, then tps...thats what i would do in that order...look it up in the tsrm

This....timing includes your cps position as well as making sure your cam timing marks are lined up properly when your crank timing mark reads 0 degrees.

 

[dbsupra90]

this is what they are talking about. take a meter and ohm out E2 and IDL.

 

[hvyman]

did you install the cps correctly?

 

[beemadaz23]

the air flow meter is plugged in, the timing and cps unit are all spot on, got to check the throttle position sensor this evening. Then it will have to be the injector wiring, been told that can be plugged in incorrectly and cause problems ( does anyone know where i can find details of multiplugs etc, or know it off the top of they're head)
dazza

 

[kamikazemkiii]

check to make sure u have your spark plug wires in the right order