Engine stumbling, recent 1.8 swap into 1991
#1
Engine stumbling, recent 1.8 swap into 1991
Hey guys,
I've come across a problem that is starting to drive me a little nuts mainly because I've spent so much time, effort, and money completing this 1993 Escort GT engine swap into my '91.
What's happening is the car is stumbling under abrupt throttle inputs off idle, and also stumbles under high load conditions in the lower RPM range (usually).
The car is throwing a code 9 for water thermistor open or short circuit, which seems odd as this is the same sensor I used on the previous engine and it has been carefully handled, etc. I will replace this with a known good tonight and report back.
Also, I am using the Flyin' Miata throttle body adapter plate to use my 1.6 TB on a 1.8 intake mani. I have the air inlet to the ISC plumbed into the intake, but the coolant lines are just capped right now. I hear many people have done this and it should only affect idle quality and not cause this stumbling.
The timing was set correctly and the engine runs great if you're easy on the throttle and in the upper rev range.
What do you guys think? Are there any other variables I should be looking into, ideas?
Thanks.
I've come across a problem that is starting to drive me a little nuts mainly because I've spent so much time, effort, and money completing this 1993 Escort GT engine swap into my '91.
What's happening is the car is stumbling under abrupt throttle inputs off idle, and also stumbles under high load conditions in the lower RPM range (usually).
The car is throwing a code 9 for water thermistor open or short circuit, which seems odd as this is the same sensor I used on the previous engine and it has been carefully handled, etc. I will replace this with a known good tonight and report back.
Also, I am using the Flyin' Miata throttle body adapter plate to use my 1.6 TB on a 1.8 intake mani. I have the air inlet to the ISC plumbed into the intake, but the coolant lines are just capped right now. I hear many people have done this and it should only affect idle quality and not cause this stumbling.
The timing was set correctly and the engine runs great if you're easy on the throttle and in the upper rev range.
What do you guys think? Are there any other variables I should be looking into, ideas?
Thanks.
#11
lol, I love this thread already.
Anyways it ended up being a combination of the water thermistor and the coil pack grounding to the head. Just a heads up but if anyone completes this swap in the future the FM coil mounting bracket doesn't work for FWD engines or at least the 93 Ford Escort GT engine. It's possible to make the original 1.6 bracket work with some creative hacking with a hacksaw, sawzall, or plasma cutter (easy).
Seems to be running great now! Next on the list is a wideband and a Megasquirt.
Anyways it ended up being a combination of the water thermistor and the coil pack grounding to the head. Just a heads up but if anyone completes this swap in the future the FM coil mounting bracket doesn't work for FWD engines or at least the 93 Ford Escort GT engine. It's possible to make the original 1.6 bracket work with some creative hacking with a hacksaw, sawzall, or plasma cutter (easy).
Seems to be running great now! Next on the list is a wideband and a Megasquirt.
Thread
Thread Starter
Forum
Replies
Last Post