Secondary Injector Issues
07-22-14, 10:48 PM
#1
Secondary Injector Issues
Long story short I have an 87 TII with 96K on the clock. She sprung a massive water leak from the LIM, so while I was in there I ported the waste gate, added a 3 inch down pipe with no cat, Rtek 1.7 ECU with corresponding 720cc secondary injectors (brand new) and brand new 550cc primaries as the car had a tendency to flood, and K&N Cone filter. I have a good boost gauge and Koso digital AFR gauge.
The car runs fine, except when it hits the 3500 RPM transition there is a big lean bog, and if I hold any kind of boost I get stoich readings in the mid 13's to low 14's range...which is much to lean and wayyyyy worse than stock. This leads me to believe the secondary injectors are not working. I have the UIM pulled off again and cannot find anything wrong. Any suggestions? car ran perfect before the ECU was sent away.
The car runs fine, except when it hits the 3500 RPM transition there is a big lean bog, and if I hold any kind of boost I get stoich readings in the mid 13's to low 14's range...which is much to lean and wayyyyy worse than stock. This leads me to believe the secondary injectors are not working. I have the UIM pulled off again and cannot find anything wrong. Any suggestions? car ran perfect before the ECU was sent away.
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07-23-14, 08:20 PM
#8
All grounds are in order
Checked the crank angle sensor
Checked EGI Relay
Checked resistor pack
The only thing that did not check out is the ground for the crank angle sensor wire lead. According the the haynes manual one of the terminals (terrible picture, hard to see) should should be a ground, and I am getting an ohm reading for all 4 terminals.
Checked the crank angle sensor
Checked EGI Relay
Checked resistor pack
The only thing that did not check out is the ground for the crank angle sensor wire lead. According the the haynes manual one of the terminals (terrible picture, hard to see) should should be a ground, and I am getting an ohm reading for all 4 terminals.
07-23-14, 09:52 PM
#12
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Which fuel pump are you running? I ran a similar setup except mine is a large streetport. Once the engine was built I put it in with an rtek 1.7, 720cc secondaries, and an fd fuel pump. After the break in, I realized I was having the same problem. I went through so much headache to try and isolate the problem and never could. I just ended up going standalone and I am now running an adaptronic ecu. No more hesitation, of course. I did speak with Digital Tuning about it, they told me it was my porting that is causing it. I could understand that, but have seen numerous setups this way that did not have issues.
07-23-14, 10:40 PM
#13
Which fuel pump are you running? I ran a similar setup except mine is a large streetport. Once the engine was built I put it in with an rtek 1.7, 720cc secondaries, and an fd fuel pump. After the break in, I realized I was having the same problem. I went through so much headache to try and isolate the problem and never could. I just ended up going standalone and I am now running an adaptronic ecu. No more hesitation, of course. I did speak with Digital Tuning about it, they told me it was my porting that is causing it. I could understand that, but have seen numerous setups this way that did not have issues.
Tomorrow I am going to put the car all back together and use an LED test light to see if the ECU is throwing anything at the secondaries.
I spoke with them when I first suspected I was having an issue and he told me to check grounds etc. I'll see what they have to say tomorrow.
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