sequential ??
Elite Torch Red Member
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I'm just taking a guess here, but supposedly some '93's came with the later style transmission(4L60E rather than the 4L60) in which case you would have the silver PCM rather than the black ECM, nobody has any concrete evidence that this is true, my guess is also it would have the MAF as well since that came in '94.
Also teh intake manifold would have a crossover tube.
But like I said, it's only a guess and probably wrong.
Also teh intake manifold would have a crossover tube.
But like I said, it's only a guess and probably wrong.
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Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Sequential (multi port)- each injector fires individually in firing sequence.
Batch - a bank/batch of injectors fire together (all injectors fire in one batch). One side fires then the other side.
Batch - a bank/batch of injectors fire together (all injectors fire in one batch). One side fires then the other side.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
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From: Orlando FL
My Tech 1 will not select SFI for a 93, only a 94 and up. The 93 comes up MFI.
What’s interesting is if I select the fuel system for a 94 by VIN number, it selects SFI . But if I select fuel manually by menu it comes up as MFI. Not sure if menu selection and operation is same for both, have never explored that difference. I always select by VIN, P, eighth digit
What’s interesting is if I select the fuel system for a 94 by VIN number, it selects SFI . But if I select fuel manually by menu it comes up as MFI. Not sure if menu selection and operation is same for both, have never explored that difference. I always select by VIN, P, eighth digit
Le Mans Master
Joined: Jan 2003
Posts: 8,596
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From: Portland Oregon
All 92 and 93 Y and 93 F body used the same ECM and they are both batch fire. SEFI was not introduced until the PCM hardware change in 1994. Also in 1994 the MAF sensor returned for better emissions control. The only basic difference between the older speed density batch fire cars was that they didn't have the more precise fuel control of the MAF strategy cars. However performance numbers and power ratings were basically the same. There really isn't any significant power gains between the two strategies. The main benefit is that SEFI offers some more tunability as one can trim fuel to individual cylinders. So that means it can offer slightly better tuning abilities when larger cams are used. A MAF strategy is also a bit more forgiving with engine mods. Which means tuning one is a bit easier than a SD car. But that ends if a very large cam is installed.
GREAT explanation!
Le Mans Master
Joined: May 2005
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From: Queensland, AUSTRALIA
For every one person that says late 93 cars had the 4L60-E, there is another 1 that says the first run of 94s only had 4L60s. Neither one of them can prove either statement to be a fact.
Team Owner
Joined: Aug 2000
Posts: 40,156
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From: San Pedro CA
All 92 and 93 Y and 93 F body used the same ECM and they are both batch fire. SEFI was not introduced until the PCM hardware change in 1994. Also in 1994 the MAF sensor returned for better emissions control. The only basic difference between the older speed density batch fire cars was that they didn't have the more precise fuel control of the MAF strategy cars. However performance numbers and power ratings were basically the same. There really isn't any significant power gains between the two strategies. The main benefit is that SEFI offers some more tunability as one can trim fuel to individual cylinders. So that means it can offer slightly better tuning abilities when larger cams are used. A MAF strategy is also a bit more forgiving with engine mods. Which means tuning one is a bit easier than a SD car. But that ends if a very large cam is installed.