I am almost finished with my swap, and can not get the engine to run. I have 90 PSI fuel pressure before the regulator, and reading 52 PSI on the fuel rail. All the specks I have found for the Series III engine say that 50-55 PSI fuel pressure is idea. The plugs are all new, and gapped to specs, Plug wire routing has been checked multiple times. I was at wits end trying to figure out what was wrong.
It was then that Mile O. (Cant think of his screen name) told me that he had the same problem. He said the intake could not be "open air", and a MAF had to be installed for the engine to run. The Northstar throttle body does not have one built in, and he said I have to get one from an old Chevy pickup or something.
I need a part number, make, model, year ect. to get one.
Also, there are so many tutorials on engine swaps, yet I have not seen anything on how to handle the intake. Will the Fiero filter housing work, if I adapt a tube/pipe from that to the intake? I have a K & N air filter in it now. Is this too restrictive, or should it work. Also, how and where should the MAF sensor be mounted to get the correct reading?
Most people use the Northstar MAF and locate it right in front of the Northstar throttle body.
Popular upgrades are also the early LS1 and LQ4 MAF sensors. Just be aware that by changing the TB and the MAF the flow rate outputs will change. As a starting point the MAF table from the particular sensor that you are using must be imported into the program. Later some tweaks to the fueling will be needed to match the new TPS voltage readings. ------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 01-01-2017).]
Thanks for all the help. My wiring harness was done by FIEROFLYER. The PCM was programmed for the Series III with A/C and the 4T65HD when I got it. I just PM'd him to see if there is a particular one that he had set up the PCM for.
PCM is usually programmed for the Year so I assume you have 99+ MAF programmed unless you specifically asked for a LT1 or LQ4 MAF programming to use with the N* TB.
PCM is usually programmed for the Year so I assume you have 99+ MAF programmed unless you specifically asked for a LT1 or LQ4 MAF programming to use with the N* TB.
If the 3800 MAF used matches the PCM year for that engine then I would agree all is good. Here it appears that the OP wants to upgrade but I am not certain of this. If so it should be remembered that all model year 3800 MAF sensors do not use the same frequency/flow table. The series III's in-line sensors tend to be very different. The LQ4 , LS1 (early) and N* MAF sensor are all unique and require a different table in the program. The PCM can be programmed to work with them but changes are required. ------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 01-04-2017).]