Rough idle on cold starts

Coffin88245 · Post by **Coffin88245** » 02 Dec 2019, 11:09

Just installed the Bosch 3 injectors on my 88 245 n/a.. idle and throttle response has improved tremendously. Unfortunately it now seems to have a pretty rough idle on cold starts.. after u give it a little gas and warm it for a short period of time it smoothes out and runs like a champ.. any ideas as to why this would be happening..?

93Regina · Post by **93Regina** » 02 Dec 2019, 19:01

Coffin88245 wrote: ↑02 Dec 2019, 11:09....any ideas as to why this would be happening..?

Mismatch of injectors installed to LH's default fuel program....so, once started, increase RPM for say twenty seconds, then back off throttle.

Once heated O2 sensor is active, LH "sees" the richness, and decreases fuel pulse duration for decreasing fuel input.

Coffin88245 · Post by **Coffin88245** » 02 Dec 2019, 19:12

Any way to fix the issue with a tune..? They are not performance injectors just stock upgraded as far as efficiency.