89 Beretta 5spd 3400 obd2????

[howard stren]

hello i have a 1989 beretta 5 speed. i did the 3400 swap last summer out of an 03 grand am. About 3 weeks ago, i switched to obd2 wiring harness and computer out of a 2000 grand am.....so the problem i'm having is that the car is bogging at wot.... why would it do this???? maybe car is thinking its in limp mode??? Can the car run off this set up even if its a 5 spd? please HELP!!!!

[omega_5]

We'll need more info... logs, swap details, etc.

However from the info provided, I will assume that it's a MAF cal issue. When you did the swap, you probably custom fabbed an intake, thus affecting the flow around the MAF.
Again, it's hard to tell without more info.

[howard stren]

yeah it seems the hotter it get the harder it is to pick up speed.ok so if i bit the bullet and get a cold air intake for the car would i be good? pcm for less said they can tune a 2000 grand am 3400 5 spd. and thats what i have but a beretta....sorry but im already in a grand and want to finish this the right way now so let me know thanks?

[omega_5]

Honestly, it's really hard to say what the problem is, without seeing a scan or something.

The thing is, when doing a swap, a lot of parts are 'custom fabbed'. These parts can potentially throw off a tune. Using a canned tune for X vehicle may not be the right way to go, and could make things worse. A custom tune is probably the best way to go.

[omega_5]

Why is it that most motor swaps go this way?
Ton of cash into the swap, zero funds left to get the tune to work right.

[omega_5]

As mentioned in the reply to your PM; unless you have an HPT system, it's not very possible to tune through the net. You'd need a way to scan the car, and a way to flash in the tune.

[howard stren]

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[howard stren]

the dtc codes are po131 po463 po753 po758 p1860 u1000

[howard stren]

the rest of the datalog

[omega_5]

Are you sure that the engine and tranny were a package?
P0753, P0758, P1860 are all automatic transmission codes.

Besides that, P463 is a fuel level code... one that is typical of a swap if the level sender was not swapped as well.

Finally, the one that concerns me is P0131. Either you have a leaky exhaust before the O2 sensor, or you are running lean, which could be due to a fueling issue, or vacuum issue.


Edit:
What were the conditions for each log? How did the car act?
As well, can you provide a few pictures of the engine, as it is now?
I'm still convinced that the big issue here is a physical failure on the car, from a part added or not added during the swap.

[howard stren]

the trans is the one the car came with in 1989 muncie 5 speed the wiringharness is 2000 grand am and computer the motor is 2003 3400

[omega_5]

It all makes sense now....
Before you go into anything too deep, you'll have to delete the automatic transmission off the PCM. As far as I know, it's just a matter of setting the automatic transmission codes to disabled.

Also, when you did the swap, did you wire the PCM so that it will 'see' the transmission as being in drive at all times?

[howard stren]

found vaccum leak fixed still runs the same p0131 does not come back now. log 1 is startup. log 2 was cruise. check coolant temp and tps % for other logs

[howard stren]

i did change trans codes and jumped wires so it thought it was in drive previousely but put it back to original so you would see everything but i will delete codes again and jump wires again

[omega_5]

Does the car run better now that the vacuum leak is fixed?

[howard stren]

no change after repair of leak

[omega_5]

Well, maybe return everything back to how you had it, with respect to the transmission.
As well, you will still want to delete the solenoid and torque converter codes.

Once everything is done, maybe post up another log.

[howard stren]

here are new logs after changes

[howard stren]

maybe something is wrong with the cam sensor?

[MMGT1]

Hey Robert, Paul here. Here is the Config for you to use today so we can get into this thing.

Attachment 20608