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Old 06-10-2022, 02:40 AM   #1
68 stang
 
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Default 97 hardbody new engine won’t run well

Hey guys, I just signed up to this site to help my father out. He has a 97 but bought a 93 engine from Napa. He can’t get it to start cold and when it does warm up to idle you can’t give it any throttle or it will puke out. Here is what I know. I read many posts and then I personally put the engine on TDC verify that the oil pump shaft is in the right location. He used a new distributor for the 97 but had to cut the mounting tab in order to time it since the block is different. I verified that tdc is tdc and rotor is at #1 and the wires were routed correctly. He is the kind of guy who buys parts until it is fixed. Well 5 years later it still isn’t running right. I did time the dizzy to 10 degrees. He has new fuel pump, fuel regulator, TPS and who knows what else. It also runs extremely rich. I took video of it running but I can’t seem to get it to upload.
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Last edited by 68 stang; 06-10-2022 at 03:12 AM. Reason: Forgot to add something
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Old 06-10-2022, 02:54 AM   #2
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Could be many things, unfortunately. E.g., bad timing chain alignment. But I'd start with a smoke test to check for vacuum leaks, and then test the EGR system.
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Old 06-10-2022, 03:13 AM   #3
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I did spray carb cleaner for vacuum leaks because that’s what I was thinking. I haven’t checked the EGR though. Timing is correct for sure.
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Old 06-10-2022, 04:18 AM   #4
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Welcome to IN...

Quite the mismatch here... 93 to 97'? Still have the orig engine? Might need to transfer much hardware, if it will work. 1996 started OBD2, 93' is flashing LEDs...


Got a FSM yet? (look down vvv)

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Old 06-10-2022, 04:09 PM   #5
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I don’t know if he still has the original engine or not. The dizy is new for a 97 but hey cut the bolting tab to get it to time as the blocks are different. It runs rich real rich and no codes.
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Old 06-10-2022, 09:00 PM   #6
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what exactly did he buy from napa? the short block (block, slugs, rods & crank) long block? (includes head/cams and internals)



the 96 is an OBD2 car and the 93 is an OBD 0/1. all that OBD 2 crud is used on startup. however 99% of it is in the manifolds not the block/head. im wondering if you have an unplugged sensor somewhere.



the running rich is normally a sign of a vacuum leak downstream of the MAF. on this truck the MAF is in the throttlebody (ish).



heres my suggetion, loosen the distributor, start it, and slowly twist the distributor and see if it gets any healthier. i think something might be off a tooth. you shouldnt have to remove a tab or something to clock the distributor that much if its all properly in time.
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Old 06-10-2022, 09:53 PM   #7
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He bought the long block. Just added the standard stuff. As for the dizzy I also did adjust it to see where it ran the best etc. then I used a timing light to set time at 10 tdc. Seems the throttle response is snappy but as soon as you touch the throttle it wants to fall in its face. I do have a video of it running but I can’t seem to post it on here. I’d be happy to text it to anyone.
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Old 06-11-2022, 02:09 AM   #8
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Going from an OBDI to an OBDII motor should require extra emission parts. As the ECM(computer) has different software to control the various subsystems for emissions control and thus, fuel delivery.

Also, a code reader in Live Data setting will show the O2 sensors working or not. Stychiometric air to fuel ratio is 14:7. That's perfect air to fuel ratio. So you want to see 0.0 Short Term Fuel Trim(STFT) and 0.0 for Long Term Fuel Trim(LTFT) with no systems in Open Loop, which the code reader should show for any systems in that open mode or after a Check Engine Light code(s) was erased with a scanner.

It is "quite the mismatch" for sure.

You should compare the 95 manual to the 97 manual in the EC Section for Engine Control and see what parts are needed to make the switch "successfully". I don't know if it can be done. But I'm routing for Ya!

Edit - I believe the ECM’s are different as well because of the OBDI to OBDII Engine Control software. I think this is key here for this issue. Unless the ECM’s have already been swapped out to reflect the engine control software for the proper engine(93-95 engine ECU for OBDI and a 96-97 model year ECU for OBDII emission and engine control).
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Old 06-11-2022, 02:56 AM   #9
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But if he swapped all the 97 over to the long block then what would be the mis match? Other than the long block.
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Old 06-13-2022, 01:23 PM   #10
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I would start going over anything intake related. Check all the gaskets on the throttle body and most likely replace them or use gasket maker to re-seal it. Check all the vacuum lines and get a vacuum gauge to confirm as they are pretty cheap. Even a small intake leak after the butterfly will cause these trucks to barely run. You can also try unplugging the MAF sensor and see how it idles with it unplugged. If it starts and idles better you may indeed have an intake leak.
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