Question about 1996 GMC Safari

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Hello, I have a GMC Safari in 1996 and I have a problem with the automatic transmission: the van easily change from first gear to second, but when he has to go to third gear is as if it were in neutral. The problem occurred suddenly without any warning, the only problem that has given me is the warning light "service engine soon" and in this case, the van had problems to change from third gear to hatred. I think the problem might be caused by the body or solenoid valves. I apologize if my English is not good but I live in Italy Thank you in advance for your reply. Cordially Antonio Pietrobono

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  • antonio pietrobono May 21, 2011

    Hallo, I've checked the fluid level and fluid leaks but all is ok.

  • antonio pietrobono May 21, 2011

    Hallo, i've changed the fluid and the filter one week ago.

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  • GMC Master
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Ciao Antonio.

Ti ho inviato una risposta all'ultima domanda sull'altra richiesta. La replico qui:

Ciao.

Se il van ? in modalit? protetta , come posso fare per ripristinarlo in modalit? normale?

La luce Service Engine Soon si resetta co no scanner OBD2 (anche se ci sono codici nel TCM o negli altri moduli, come BCM o ABS). Forse con gli scanner molto economici come quelli da $50 ci puo essere qualche problema ma non credo. Un altro modo e' staccando la battaria per un paio d'ore.I moduli non hanno molta autonomia.

Il fatto e' che la luce ritorna finche non risolvi il problema. Una volta che il problema e' risolto, la luce, ed anche i codici nei moduli si resettano automaticamente dopo un numero di cicli di accensione.

Qui in Italia non ? facile trovare uno scanning per il cambio automatico, mi sono rivolto alla GM e mi hanno risposto che solo per smontarlo e inviarlo a torino vogliono 700 euro (980$).

Vedo adesso che il van e' del 1996. Quindi dovresti avere un codice P0700, che vuol dire che ci sono altri codici nel modulo della trasmissione. Ieri avevo letto nel titolo principale 1993 e pensavo che fosse OBD1. Se e' OBD2 lo scanner che serve e' un tech 2. Qui il piu semplice: GM Tech-2 Scanner

Non capisco una cosa: se fosse il TPS il van non dovrebbe cambiare neanche dalla prima marcia alla seconda .

Non necessariamente. Il TPS usa una resistenza variabile per cambiare il voltaggio. Se questa e' rovinata in un certo punto, puoi aver problemi con le marce alte. Il TPS si puo testare ma credo che la risposta sia in fondo a questa pagina.

Io ho controllato in modo empirico i solenoidi della 1-2 e 3-4 testandoli con una batteria , inviando la tensione a 12V . Quando invio la tensione il solenoide risponde con un 'tac' e quindi ho pensato che funzionasse bene.

Se scattano di solito funzionano.

Quando ho smontato il solenoide della 1-2 il pistoncino nel corpo delle valvole ? venuto fuori perch? c'? una molla che lo spinge, mentre quando ho smontato il solenoide della 3-4 il pistoncino non si ? mosso e non veniva fuori molto facilmente . Io non so se il pistoncino della 3-4 ? azionato da una molla oppure dalla pressione del cambio. Io ho pensato che ci fosse una molla rotta dietro al pistoncino della 3-4 ma dopo un'ispezione non ho trovato nulla anche se ? difficile riuscire a vedere fino in fondo alla sede del pistoncino della 3-4.

Qui ci siamo....mi sa che hai una scatola di trasmissione rotta. se il pistoncino 3-4 e' andato dentro la trasmissione va riparata o ricostruita e son dolori. Non credo che li si possa trovare una scatola del cambio allo sfasciacarrozze. Qui ci sono gli esplosi della trasmissione.

Posted on May 21, 2011

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  • Master
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Thanks for choosing FixYa and welcome.

Posted on May 20, 2011

  • Richard Hale
    Richard Hale May 20, 2011

    Have you checked your fluid level yet? Also, have you checked for transmission leaks? Thanks.

  • Richard Hale
    Richard Hale May 21, 2011

    First of all, drop the transmission pan, and clean it out. Change the filter, reinstall a clean pan and new gasket. Refill with some new fluid and see how it runs. You could have a bad valve. You are right about that. You need to make sure it is not leaking also.

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