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VG30i now Runs, but wont rev past 3000 rpm :(

bmcgawain

By bmcgawain,
in General Forums

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bmcgawain NPORA Regular

bmcgawain

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I am excited that my jdm crate engine is now installed and functional :jig: But, I cannot figure out why it only revs to 3,000 rpm. I have replaced the old ass fuel filter and checked for any loss of ignition such as arching of the wires, cap, or rotor. All are good at this point. (I used the misting water bottle trick at night to confirm no arch) Now I am starting to speculate, but nothing concrete. TPS? Coolant Temp Sensor (the one to the ecm, not gauge), Mass air flow? How do I check any of these?

Now keep in mind that although i have a used engine that had been sitting in a warehouse for god nows how long,I did swap the entire intake plenum, throttle body and air ducting (timming belt, water pump etc). I wanted to make sure that the used engine wasnt full of debris in the intake system. That being said, the swapped parts worked perfect on the original engine all the way up to the head gasket blowing. So my thoughts were if it worked before, why not now? Maybe im missing something obvious here? Any suggestions would be awesome! Im trying to drive this beast 200 miles south this weekend :crossedwires:

-peace

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Tungsten NPORA Old-Timer

Tungsten

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I have no idea how you test the TBI sensors, only did MPFI sensors before. However not being able to rev past 3000 rpm is a common sign of MAF sensor failure. You can get the codes from the ECU to be sure. Check the HowTo section of this forum for more info on how to get codes from the ECU.

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bmcgawain
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bmcgawain

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Well I pulled a code 12 MAF and a code 33 O2 sensor. Purchased a MAF from Orielly's today. Gonna cross my fingers that it fixes everything. Thanks for the reminders of how to retrieve those codes. The how to section is great :)

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Kingman NPORA Old-Timer

Kingman

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Well I pulled a code 12 MAF and a code 33 O2 sensor. Purchased a MAF from Orielly's today. Gonna cross my fingers that it fixes everything. Thanks for the reminders of how to retrieve those codes. The how to section is great :)

 

Did you check the wiring for corrosion or breaks first? Usually that's the issue and it's free.

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Kingman NPORA Old-Timer

Kingman

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I wasn't sure about the wiring on TBI units because their MAFS is right inside the throttle body so I don't imagine them having issues with that.

 

I've had issue with the wiring to the MAF before and it made the engine do some weiiirrd stuff. Corrosion can be anywhere and usually the TPS is corroded on the TBI engines as well.

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bmcgawain
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bmcgawain

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I've had issue with the wiring to the MAF before and it made the engine do some weiiirrd stuff. Corrosion can be anywhere and usually the TPS is corroded on the TBI engines as well.

 

Have you ever had problems with the tps causing the same issue I'm having?

 

I purchased an air flow sensor and the parts house was tring to tell me th air flow meter from a 3.3 was the same for mine. After lots of conversation I convinced him otherwise. Bottom line, they cannot even order the correct part on the 87. Now I'm back to searching. Anyone know where to buy one?

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bmcgawain
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bmcgawain

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Oh, and as far as corrosion, I did check the plug on the mass air flow, but nothing. I haven't messed too much with the tps. But, I did literally just connect all these plugs about two weeks ago as the engine was just installed and hooked up. I did make a conscious effort to inspect every plug end prior to plugging it in. Nothing looked bad. As far as testing the harness.... Not really sure where to start. Volt meter and continuity test?? :/

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Kingman NPORA Old-Timer

Kingman

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Have you ever had problems with the tps causing the same issue I'm having?

 

I purchased an air flow sensor and the parts house was tring to tell me th air flow meter from a 3.3 was the same for mine. After lots of conversation I convinced him otherwise. Bottom line, they cannot even order the correct part on the 87. Now I'm back to searching. Anyone know where to buy one?

 

Not really.

 

I have a good MAF for one of these.

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bmcgawain
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bmcgawain

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Not really.

 

I have a good MAF for one of these.

Would you be interested in selling that extra? I would like to get this thing running ASAP. Name your price plus shipping and I can paypal it tonight :)

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