Need help with a TBI chevy truck trans. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 08-03-2007, 04:11 PM Thread Starter
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Need help with a TBI chevy truck trans.

Guys,

I have a '90 Chevy pickup with a 350TBI. I had a 4l60E in there until last weekend when I swapped it back to the original TH400. I have all the connections back in place except for the vacuum modulator. I can't seem to remember which port it connects to on the TBI unit. Any help would be appreciated - especially it a picture is involved!

Thanks!

-Evan

2000 Ford F250, Merillion, 6sp, AIC, DPTuner, BB turbo, Adreneline pump, modified IDM.

1998 Mercedes E300, Custom injector nozzles, soon to have Eaton M90 supercharger, 7.5mm pump elements, Holset HX40 turbo and a full custom intake and exhaust system = 400HP from 3.0l
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post #2 of 4 (permalink) Old 08-04-2007, 02:33 AM
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It goes to one that has vacuum at idle. Including the manifold

keydl

93 Dodge /CTD, IC, 518, club cab LE, BHAF, KDP fixed, kelderman air ride
81 Isuzu /C223na, 5spd
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post #3 of 4 (permalink) Old 08-04-2007, 01:24 PM
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Actually, it goes right to the manifold, the steel line is tapered to fit right into the t on the back, right in front of the distributor. Low vacuum=late shift.

The workhorse: 86 F250 6.9 4 speed 4wd 4.10 gears, electric fuel pump
The other workhorse: 92 F350 2wd crew cab, 92 6BT Cummins, NV4500 and GV overdrive unit, 4.10 rear axle
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post #4 of 4 (permalink) Old 08-05-2007, 12:34 AM Thread Starter
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OK, thanks. I'll check it out next time I'm working on it.

-Evan

2000 Ford F250, Merillion, 6sp, AIC, DPTuner, BB turbo, Adreneline pump, modified IDM.

1998 Mercedes E300, Custom injector nozzles, soon to have Eaton M90 supercharger, 7.5mm pump elements, Holset HX40 turbo and a full custom intake and exhaust system = 400HP from 3.0l
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