Hey guys, Been out for a while. Need your expertise. I returned My 96 GT to stock (NPI cams, NPI intake, stock tune) since I am selling it to a friend and that is how he wanted it. Now it runs awful, it will idle fine but at 2800+ rpm's it really struggles to get moving but there are no DTC's showing. What are your suggestions? I hope I didn"t skip a tooth on a cam, but I was very careful. Thanks in advance.
Car runs like Crap
- Thread starter Mel96GT
- Start date
joshjwc9
Active Member
When was the Fuel Filter changed? How about spark plugs?
Try resetting the battery for it to learn the new or old trim values too.
I am sure some better know-it-all's will chime in soon too.
Try resetting the battery for it to learn the new or old trim values too.
I am sure some better know-it-all's will chime in soon too.
mustang_matt
New Member
sounds like a timing thing to me. Maybe not advancing. Is the pip/spout in? Or check the harness grounds. Bad grounds can cause all kinds of weird issues
wmburns
SN Certified Technician
Check the base motor. Perform a compression test and cylinder leak down test.
Check for correct fuel pressure.
OBTW, 96+ don't have a pip/spout. Advance is completely controled by the PCM.
Check for correct fuel pressure.
OBTW, 96+ don't have a pip/spout. Advance is completely controled by the PCM.
nyuk98gt
15 Year Member
Mel96GT:
In addition to the other good suggestions given, I'll add one more (may or may not be a good one). Check that the plug boots have not slid down on the wires. When this happens the wire clips are not fully contacting the plugs and the engine will run poorly. Use an old plug to test fit each boot/wire. The boots slide up and down on the wires. Be careful not to bend/break a wire as you adjust the boot. The other thing to check is that each wire is giving about the same "ohms/foot": check resistance and divide by total length for each wire.
HTH,
Chris
In addition to the other good suggestions given, I'll add one more (may or may not be a good one). Check that the plug boots have not slid down on the wires. When this happens the wire clips are not fully contacting the plugs and the engine will run poorly. Use an old plug to test fit each boot/wire. The boots slide up and down on the wires. Be careful not to bend/break a wire as you adjust the boot. The other thing to check is that each wire is giving about the same "ohms/foot": check resistance and divide by total length for each wire.
HTH,
Chris
All solved!! The plugs had some water and oil and after blowing the water and oil out and the car ran MUCH better. 
That was it now the car runs fine. I'm surprised how much decent torque the NPI has at low rpm's. Still a slug tho! Thanks guys it shows how important it is to keep those plugs dry!!!
That was it now the car runs fine. I'm surprised how much decent torque the NPI has at low rpm's. Still a slug tho! Thanks guys it shows how important it is to keep those plugs dry!!!
nyuk98gt
15 Year Member
Mel96GT:
Thanks for the update. This will help others who have rough-running engines. Good work getting Old Paint running well.
Chris
Thanks for the update. This will help others who have rough-running engines. Good work getting Old Paint running well.
Chris
Eleanor's Girl
Member
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