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Hi new guy here got some cpu and tbi questions

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LargeMouthFeaver

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Hi names william im a new guy been browseing the forum reading the inejection section hard,

First things first chevy caprice 9c1 police cars were tbi injection up till 93 94 they got lt1 motor,
I just bought a 88 k5 this week driveing it home night i bought it it threw the rods threw the oil pan.
I have a 92 caprice tbi ex cop car 5.7 lt
I pulled motor out the truck yesterday. today we pulled the motor out the caprice and sat it in the k5.
We reused the trucks exhuast manifolds. swaped the old sensors over. looks like im gonna be able to retain the 92 smog pump and serpentine setup
The questions i have is
The newer tbi unit has a totaly difrent type and style of tps sensor difrent plug bolting method . Will the 88 cpu run the newer style tps sesnsor? if i swap the conector from the new motor to the old harness?

Could i use the newer cpu out of the caprice in the k5 blzer? has anyone tried this yet. or would i need the whole harness to cus thats hacked on the caprice.

I noticed theres some very smart people here on tbi systems thinking maybe one u gurus could help a new guy out. Im hopeing to have the truck running tomorow wich is sunday.

I has to finish bolting the trans in , install the rad hook fuel lines up few sensors adapt the newer style altinator to the older wireing tighten a few bolts here and there. Please any info be greatly appreciated:bow:
 
O i forgot to mention the newe tps sensor has three wires and there the same color wires as the ones on the truck the plugs are difrent

any opinions wellcome
 
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Use the complete TBI unit from the 88 on the 92 motor.

The 92 9C1 Caprice has a different ECM then a stock Caprice and larger injectors than a stock 5.7L. There also differant transmission controls. Sell or save the cop car injectors as they are rare and sought after for high performance upgrades.
 
brian at www.tbichips.com has tons of good info.

and for your needs use the long block only and all the blazer stuff on to it. dont forget the cop car motor will be roller cam and the dist is diffrent for the cam gear. so cop car dist will need to be used. and if you readup at tbichips and talk with brian and want more power you can swap those injectors to the truck tbi unit and get a chip/pump/spring to make alot more than stock.
 
sweetk30 said:
brian at www.tbichips.com has tons of good info.

and for your needs use the long block only and all the blazer stuff on to it. dont forget the cop car motor will be roller cam and the dist is diffrent for the cam gear. so cop car dist will need to be used. and if you readup at tbichips and talk with brian and want more power you can swap those injectors to the truck tbi unit and get a chip/pump/spring to make alot more than stock.
Click to expand...

Actually, even though it's a factory roller cam any distributor will work since the cam is billet but the distributor gear on it is sintered iron.
 
im reuseing the exhust and 99 percent the sensors off the k5 but i wana retain the caprice tbi unit will the k5 cpu run the caprice tbi?

The distributer in the caprice motor is staying in the caprice motor nothing wrong with it. and the harness has same plugs. Only difrences im finding in the two motors was the k5 had some older style sensors. and the tbi unit had difrent tps sensor. im also retaining the serpentine belt setup from the caprice into the truck .
 
Today i got the tps sensor taped into the old harness. Fuel lines conected with alittle bending. Powersteering lines hooked up to the newer caprice power steering pump. Had to tweak the lines in a few spots to get them were i needed but was worth it to retain the serpentine setup . The caprice smog pump is being reused. I used hose clamp to hold the hose from the pump to the k5 tube the conects to exhust manifolds. Had to use the upper radiator hose off the caprice due to fact my altinator is now on the other side of the truck and the k5 houseing pointed it right at the back of the altinator.I bought new motor mounts discoverd nobody had the ones there comp had listed for the truck well they had them but wernt the right style. I asked them to see one for a 92 caprice same ones i needed for the truck for 20 bucks cheaper both were under ten bucks each ;)

Tomorow i hook the starter up adapt the old altinator wires to new style plug bolt the coil down. tighten the xhuast flanges up. 1 heater core hose needs hooked up top off the fluids pray realy realy hard to every god in the world and turn the key wooooot
 
Keep in mind that the caprice injectors are to big for the factory chip in your K5's ECM. You're going to have some driveability issues i think.
 
That leads me bac to i have the caprice cpu also. What exactly do i need to check on the caprice cpu harness plug with the harness plug on the k5 to use the cop car cpu? just make shore each wire color coded is in same position on the other cpu? then just plug and run?

Worst case theres a local guy who reprograms tbi cpus but ide like to try and use all the stock stuff if possible. befor going the custom cpu route
 
4X4HIGH said:
Keep in mind that the caprice injectors are to big for the factory chip in your K5's ECM. You're going to have some driveability issues i think.
Click to expand...


wouldnt the cpu send the same signal no matter what size the injector is? May be nub question but this first time i ever tried to swap stuff like this so its all new to me . pluss i still have the k5 tbi unit just in case :wink1:
 
LargeMouthFeaver said:
That leads me bac to i have the caprice cpu also. What exactly do i need to check on the caprice cpu harness plug with the harness plug on the k5 to use the cop car cpu? just make shore each wire color coded is in same position on the other cpu? then just plug and run?

Worst case theres a local guy who reprograms tbi cpus but ide like to try and use all the stock stuff if possible. befor going the custom cpu route
Click to expand...

Even if the caprice uses the same ECM the chip will be different. The chip contains specific info based on the vehicle like timing curve, fuel curve, pulse width of the injectors, TTC lockup, and various other things. What works for the caprice will not work with a 6000 lb. truck. The only way to make this work if you keep the caprice TBI unit on it is to have a chip burned for the application. Why are you so insistant on running the caprice TBI? The only difference is the TPS switch and the larger injectors, the TBI unit flows the exact same as your K5 TBI.
 
LargeMouthFeaver said:
What exactly do i need to check on the caprice cpu harness plug with the harness plug on the k5 to use the cop car cpu? just make shore each wire color coded is in same position on the other cpu? then just plug and run?
Click to expand...

Just a word of advice...don't ever, ever assume something with electrical systems.

GM was very good about using the same wiring color and plug positions among the various setups, however one swapped wire and the ECM could be toast.

The only way to do it correctly is to get the wiring pinout out of the factory service manual for both ECM's, and compare.
 
Y would i wana run the caprice tbi unit . its because i no its good . The car was ex police car came with heavy duty altinator. A factory oil cooler. factory trans cooler factory powersteering cooler. Has a oil pan heater for winter time. Had more hp then your base 5.7 lt motors of the same year. The caprice wheighs about the same as the truck. The caprice was my dailey driver for years. The blazer i just bought drove home and threw the rods out the oilpan the night i bought it. To me everything is questionable on the old motor.

Ive kept theold tbi unit for incase it run poorly. + i have two 92 caprice 9c1 police car cpu i have a second police car tbi unit a second set of serpentine accesorys. And the car got 20+ mpg on the highway would do 138 mph in third gear , when it hit into over drive it was doin 143 mph i nvr took it faster didnt need to .

The k5 is gonna be used for mudding rock crawling trail rideing and my daily driver.
 
The Chevy Caprice weighs between 3,995-4,471 lbs. depending on equipment. A K5 weighs a good bunch more than that. I have weighed my K5 and it weighed 5,880 lbs. that does have a D60 and 14FF which did add some weight.
 
LargeMouthFeaver said:
That leads me bac to i have the caprice cpu also. What exactly do i need to check on the caprice cpu harness plug with the harness plug on the k5 to use the cop car cpu? just make shore each wire color coded is in same position on the other cpu? then just plug and run?

Worst case theres a local guy who reprograms tbi cpus but ide like to try and use all the stock stuff if possible. befor going the custom cpu route
Click to expand...
The 88 K5 uses a 700r4 trans, the caprice is a 4l60e I believe. The 92 caprice and 9C1 also has an IAT (Incoming Air Tempreture sensor). The cop car is not the 1227486 ECM I beleive its a 16136965
 
4X4HIGH said:
The Chevy Caprice weighs between 3,995-4,471 lbs. depending on equipment. A K5 weighs a good bunch more than that. I have weighed my K5 and it weighed 5,880 lbs. that does have a D60 and 14FF which did add some weight.
Click to expand...
Forgot to mention aerodynamics. The Caprice is actually a modern car, the K5 is shaped like a brick!
 
eagle mark said:
Forgot to mention aerodynamics. The Caprice is actually a modern car, the K5 is shaped like a brick!
Click to expand...

This is also true. The old saying "you can lead a horse to water but you can't make him drink". Some people just have to learn this on their own even though they're being told by people who have tried this.
 
Well i have it running drove it around the block twice. Need to tidy a few things up tomorow dust shield a hose clamp on the emisions stuff. I got it running useing the old oil, temp, sensors , it has the 92 serpentine system useing the bigger altinator. off the caprice. I have the caprice intake on it useing the caprice throtlebody for now. I still got the k5 tbi unit so no biggie aint hard to swap. Broke the plug on my o2 sensor doh! so i got check engine light on beleve its from the o2 . All my guaegs are working fine altinators chargeing powersteering pump is working fine everything seems to be working. Wont get to take it for any kind of real drive for a couple days till i get tags on it. By friday it should be taged and sitting on 34 10/50 15 LTBs. I also still have the old distributer incase i need to swap it over. But it fires right up idles great will let u guys no how it is once i get a real road test down.
 
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